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How to Pass Variables from Javascript to PHP

Last Updated: January 6, 2021

This article was co-authored by wikiHow staff writer, Darlene Antonelli, MA . Darlene Antonelli is a Technology Writer and Editor for wikiHow. Darlene has experience teaching college courses, writing technology-related articles, and working hands-on in the technology field. She earned an MA in Writing from Rowan University in 2012 and wrote her thesis on online communities and the personalities curated in such communities. This article has been viewed 26,425 times. Learn more...

In many instances, JavaScript is used on the client-side and PHP is used on the server-side of a website. This wikiHow will teach you how to pass variables (or data) between JavaScript and PHP using either a "GET/POST" method or using cookies.

Using "GET/POST" Commands

Step 1 Enter the following code into your HTML:

  • This code lets the user to your website enter information. [1] X Research source

Step 2  Enter the following code into your PHP code on your server:

  • Even though the user entered information in a JavaScript environment, their data will be passed through to PHP on the server-side.

Step 3  Test your code.

Using Cookies

Step 1  Enter the following code into your website coding:

  • As coded, the cookies will expire within 10 days.

Step 3  Test your code.

Community Q&A

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  • ↑ https://www.geeksforgeeks.org/how-to-pass-javascript-variables-to-php/

About This Article

Darlene Antonelli, MA

1. Enter the following code into your HTML. 2. Enter the following code into your PHP code on your server. 3. Test your code. Did this summary help you? Yes No

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Assign a Javascript variable to PHP variable

Why do we assign a javascript variable to a php variable .

There are many reasons why one might want to assign a Javascript variable to a PHP variable. Some possible reasons include:

-To pass data from Javascript to PHP (for example, to use PHP to process or store data that was entered into a form via Javascript)

-To make use of PHP's built-in functions and libraries from within Javascript

-To take advantage of PHP's faster execution speed when working with large data sets or complex algorithms.

Use document.cookie and $_COOKIE to assign a JS variable to a PHP variable

The document.cookie is used to store cookies in javascript and  $_COOKIE is a PHP superglobal variable that is used to access cookies. We will use document.cookie to store javascript variable value to a cookie and access it in PHP using $_COOKIE .

In the above code example:

  • We have a Javascript variable named  user_name that contains a string value.
  • We are creating a cookie named name in Javascript and assigning it the user_name variable value.
  • In the PHP code, we are getting the cookie using  $_COOKIE['name'].

user image

The first time you log in it doesn't work. If you reload the page everything is fine. This is because php will execute first only then the javascript.

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set javascript variable with php

Buckle up, fellow PHP enthusiast! We're loading up the rocket fuel for your coding adventures...

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set javascript variable with php

  • How do I pass JavaScript variables to PHP?

Hey everyone, I hope you're all doing great. I have been working on a project that involves passing JavaScript variables to PHP, and I'm facing a bit of a roadblock. I have done some research, but I'm still unsure about the best approach. Let me provide you with some context. In my project, I have a JavaScript variable that holds some user input data. I need to send this data to a PHP file for further processing and database storage. How can I achieve this? Any suggestions or guidance on how to pass JavaScript variables to PHP would be highly appreciated. Thank you in advance for your help! Best regards, [Your Name]

All Replies

clemmie.hilpert

Hello [Your Name], Passing JavaScript variables to PHP is a common challenge, and I'd be happy to share a different approach that has worked well for me in the past! Instead of using AJAX or the Fetch API, you can utilize a hidden HTML form to dynamically send your JavaScript variable data to a PHP file upon form submission. Here's how you can make it work: 1. Create an HTML form with a hidden input field to hold your JavaScript variable value. 2. Attach an event listener to a button or form submission event, which triggers a JavaScript function. 3. In the JavaScript function, assign the variable value to the hidden input field. 4. Submit the form programmatically using the `submit()` method. Check out this code example for clarity: html <!-- HTML code --> <form id="myForm" action="your-php-file.php" method="post"> <input type="hidden" id="hiddenData" name="data" value=""> <button type="submit">Submit</button> </form> <script> // JavaScript code var data = "example data"; var form = document.getElementById("myForm"); var hiddenInput = document.getElementById("hiddenData"); form.addEventListener("submit", function(event) { event.preventDefault(); // Prevents form submission hiddenInput.value = data; form.submit(); // Submits the form and sends data to PHP }); </script> In your PHP file (`your-php-file.php`), you can retrieve the passed variable using `$_POST['data']`, just like in previous examples. Give it a try and see if this approach suits your project requirements. If you have any further inquiries, feel free to ask! Best regards, User 3

daisy.zboncak

Hey there [Your Name], I completely agree with User 1's explanation on passing JavaScript variables to PHP using AJAX. However, if you're looking for an alternative approach, you can consider using the Fetch API, which provides a more modern and intuitive way to handle AJAX requests. To pass JavaScript variables to PHP using Fetch, you can follow these steps: 1. Create a JavaScript object with the necessary data to be sent, including the variable value. 2. Use the `fetch()` function to send the data to your PHP file by specifying the URL and method (POST or GET). 3. Set the request headers, especially if you're dealing with sensitive data. 4. In the PHP file, access the variable using `$_POST` or `$_GET`, based on the chosen HTTP method. Here's an example to help you understand better: javascript // JavaScript code var data = "example data"; fetch("your-php-file.php", { method: "POST", headers: { "Content-Type": "application/x-www-form-urlencoded", }, body: "data=" + encodeURIComponent(data), }) .then(function(response) { // Handle the response from the PHP file if needed }) .catch(function(error) { // Handle any errors that occurred during the request }); php // PHP code (your-php-file.php) $receivedData = $_POST['data']; // Process $receivedData as required Don't forget to adjust the code according to your specific project needs. Hope this helps you explore an alternative method! Let me know if you have any further questions. Best regards, User 2

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tatum.renner

Hey [Your Name], I've encountered a similar situation before, so I can definitely help you out! To pass JavaScript variables to PHP, you'll need to make use of AJAX (Asynchronous JavaScript and XML) to send the data to a PHP file. Here's a brief example of how you can achieve this: 1. In your JavaScript code, create a new XMLHttpRequest object using the `XMLHttpRequest` constructor. 2. Use the `open()` method to specify the HTTP method and the URL of your PHP file. 3. Set the request header, usually using the `setRequestHeader()` method. This step is important if you are passing sensitive data. 4. Send the JavaScript variable value to the PHP file using the `send()` method. On the PHP side, you can access the sent variable using the `$_POST` or `$_GET` superglobals, depending on the method used in the AJAX request. Here's a small code snippet to illustrate the process: javascript // JavaScript code var data = "example data"; var xhr = new XMLHttpRequest(); xhr.open("POST", "your-php-file.php", true); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xhr.send("data=" + data); php // PHP code (your-php-file.php) $receivedData = $_POST['data']; // Here you can process $receivedData as needed This is a basic example, but it should give you a good starting point. Remember to adapt it to your specific needs. I hope this helps! Don't hesitate to ask if you have any further questions. Best regards, User 1

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set javascript variable with php

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How to pass JavaScript variables to PHP

by Nathan Sebhastian

Posted on Dec 07, 2022

Reading time: 6 minutes

set javascript variable with php

Sometimes, you might want to pass JavaScript variable values to your PHP code.

Before we get to the answer, please note that it is not possible to directly pass variables from JavaScript to PHP.

This is because PHP code is executed on the server, while JavaScript code is executed in the browser.

By the time JavaScript code is executed by the browser, PHP code has already finished running on the server.

However, there are ways to work around this limitation and pass data from JavaScript to PHP:

This article will help you learn the above solutions.

Use AJAX to Pass Data from JavaScript to PHP

AJAX (Asynchronous JavaScript and XML) is a technique for sending and receiving data from a server asynchronously, without having to refresh the page.

This makes it possible to update part of a web page without reloading the whole page. It’s commonly used for things like form validation and dynamic content updates.

In JavaScript, AJAX is done using the XMLHttpRequest object.

The code below shows how to use the XMLHttpRequest object to send the data to your PHP script:

In this example, we have defined a sendData() function that contains the data we want to pass to PHP, along with the XMLHttpRequest that will be executed to send the data.

This data is represented as a JavaScript object, but it could also be an array or a string.

The XMLHttpRequest object is then used to send the data to the index.php file on the server using an HTTP POST request.

In your index.php file, you can access the data that was sent from JavaScript with the following code:

In the above code, the json_decode() function converts the JSON-encoded data that was sent from JavaScript into a PHP array.

You can then access the individual elements of the array and use them in your PHP code.

When you run the sendData() function, the PHP code will be executed and a response will be given as shown below:

xhr alert() response

You can run the sendData() function by creating a <button> HTML element as follows:

You can change the alert() function called in the xhr.onreadystatechange function to fit your requirements.

Use fetch API to send HTTP request

The fetch API is a modern alternative to XMLHttpRequest that you can use to pass data from JavaScript to PHP.

Here is an example of how you might use the fetch API to pass data from JavaScript to PHP:

The code above does the same thing as the XMLHttpRequest code.

The fetch API is a more modern and flexible way to send data from JavaScript to PHP. It has the added advantage of being able to handle asynchronous requests.

However, it is not supported by all browsers, so you may need to use a polyfill if you want to support older browsers.

Use a Form to Pass Data from JavaScript to PHP

Another way to pass data from JavaScript to PHP is to use an HTML form.

When a user submits a form, the data is sent to the server as an HTTP request. This data can be accessed by the PHP script that processes the form submission.

To use a form to pass data from JavaScript to PHP, you will need to create a form on your web page and add a submit button.

Then, you can use JavaScript to populate the form fields with the data you want to pass to PHP, and trigger the form submission when the user clicks the submit button.

Consider the example below:

In this example, we have created an HTML form with two hidden input fields and a submit button.

The form’s action attribute specifies the PHP script that will process the form submission, and the method attribute specifies that the data should be sent using an HTTP POST request.

In the JavaScript code, we have defined a sendData function that contains the data we want to pass to PHP.

We then use the document.getElementById() function to get references to the form fields and the submit button.

Finally, we use the click() method to trigger the form submission.

When the user clicks the submit button, the form will be submitted to the index.php file on the server, and the data will be sent as part of the HTTP request.

In your PHP script, you can access the data that was sent from JavaScript using the $_POST variable, just as we did in the previous example.

Note that since a form submission will refresh the current page, you may not see the response from PHP.

This solution is recommended only when you need to send data to the same page.

You can then write the code that will output the response as follows:

The action attribute of the form above will submit the form to the current page.

Using a form requires you to write the HTML element on your page, then use JavaScript to manipulate the form.

You can submit the form using JavaScript or do it manually, but the output will not be shown on the page if you are sending data to another page.

That’s why this solution is effective only when you send data to the current page.

To pass variables or data from JavaScript to PHP, you can use the AJAX implementation in JavaScript (which is XMLHttpRequest ) or the fetch API.

If you need to send data to the current page, then you can also use an HTML form to send the data.

You are free to use the solutions that fit your project requirements.

Now you’ve learned how to pass JavaScript variables to PHP. Nice work!

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  • How to pass JavaScript variables to PHP

J avaScript is the client-side language and PHP is the server-side scripting language. In this tutorial, we will find out how to pass a variable from JavaScript to PHP via an HTTP request.

On the JavaScript side, the request usually involves passing a value from JavaScript to PHP. Either the URL as a parameter (which PHP retrieves it through the $_GET array) or through a POST-like request (like when someone submits a login form and PHP retrieves it through the $_POST array).

Now you can dynamically create this URL through JavaScript and send it to the server through an AJAX call (like jQuery’s .ajax method) or through something like JavaScript.location.href = URL; . In this URL, you will have the data you want to send to PHP. Below is an example of a JavaScript function that can be called by pressing a button.

Reception and processing of variables in PHP

Now that JavaScript has issued the request and passed some parameters, PHP can retrieve the data in the $_GET array.

This code will display the sum of the two variables sent from the JavaScript code:   Output:

mcq

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I have tested this code:

*Write the code at the end of the PHP page!

jsVar=document.getElementById(“tag_id”).innerHTML; alert(jsVar);

?php $phpVar=’document.write(jsVar);’; echo $phpVar; ?

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How to Pass a PHP Variable to JavaScript – Easy Way

set javascript variable with php

For something seemingly so straight-forward, you would think that the information out there would be a bit better on this subject. Passing a variable from PHP to JavaScript is actually very easy! There are just a couple things you need to keep in mind and some ways to do it to ensure it actually works.

I find that putting the following code into the <head> section of my website is the most foolproof method:

That’s it! You just define the PHP variable first, then echo it into a basic JS variable declaration statement. I know there are lots of ways to define a JavaScript variable, but this is the one I find works in the most circumstances. I’m not an expert here, but most of the others seem to not work a lot of the time.

A few things to keep in mind for this:

1. The PHP variable needs to be defined before the JS one. 2. The JS variable needs to be defined before you actually use it anywhere. This seems obvious, but if you forget this fact and try to put this declaration into the footer of your site and then use it in the content, you’ll find it doesn’t work! That’s why I like to put this in the head section of my website. Or, if you were in WordPress or another CMS, make sure to place it in the header.php file of your active theme.

Additionally, you should be aware that if your variable is not a string and is instead a number, you would want to define it without the quotes around it, i.e.:

Note that as Sherri mentioned in the comments, if you have more complicated strings or any strings with quotes (“) in them, this will break. You’ll want to look into json encoding if needed. But for simple strings and variables, this should do the trick.

Hard to go wrong with any of this. There are of course more complicated ways to use this, but I’m not going to go into any of those here. Let me know if you have any problems!

12 Comments on “How to Pass a PHP Variable to JavaScript – Easy Way”

' src=

This just helped me a ton. Thank you!

' src=

The scenario:

1. There is a php script which (possibly complemented by a direct written HTML code) consrtucts a HTML page via its echo command, based on whatever algoritmus eventually based on supplementary data from server files or databases.

2. This php script leads to data being saved into string variable(s), which (possibly) can contain arbitrary characters, including control codes (newline, tab…), HTML special characters (&,<…) and non-ASCII (international) characters.

3. These non-ASCII characters are UTF-8 encoded, as well as the HTML page (I do highly recommend) *)

4. The values of these PHP string variables have to be transferred into javascript variables for further processing by javascript (or exposing these values in HTML directly)

The problem:

it is not safe to PHP-echo such variables into HTML (javascript) directly, because some of characters possily contained in them cause malfunction of the HTML. These strings need some encoding/escaping in order to become strings of non-conflicting characters

The solution

There may be a big lot of ways of this encoding. The following one seems to me the easiest one: The PHP variable with unpredictable value can originate from some file, as an example (or from user input as well):

$variable=file_get_content(…)

1. Convert all bytes of that string into hex values and prepend all hex-digit-pairs with %

$variable_e=preg_replace("/(..)/","%$1",bin2hex($variable))

The new variable is now guarantied to contain only %1234567890abcdefABCDEF chracters (e.g. %61%63%0a…) and can safely be directly echoed into HTML:

var variable="” //that’s NOT all folks

But now the value is still encoded. To get the original value of the variable, it has te be decoded: *)

var variable=decodeURIComponent(“”)

The value of the variable is now the same as the original value.

*) I have no idea about non-UTF-8 encoded pages/data, espetially how the decodeURIComponent works in such a case, because i have no reason to use other encodings and handle them as highly deprecatad.

WARNING: this approach is not (generally) safe against code injection. I highly recommend some further check (parsing) of the value depending on the particular case.

P.S. For very large amount of data, I would recomment to save them into file on the PHP side (file_put_content) and read them by javascript via HTTP Request.

I use this approach as it needs one line of code on server as well as client side. I do agree with arguement that not all chaeacters have to be encoded.

Do not enjoy my possibly stupid solution, if you have a better idea

' src=

2. This php script leads to data being saved into string variable(s), which (possibly) can contain arbitrary characters, including control codes (newline, tab…), HTML special characters (&,<…) and non-ASCII (international) characters.

$variable_e=preg_replace("/(..)/","%$1",bin2hex($variable))

var variable="” //that’s NOT all folks

' src=

And remember, that whatever variables you add to your javascript, will be visible when anyone uses their browser to view the code in the page.

' src=

First, thanks for a great write up. I’m hoping you can offer me a simple solution here. I have to say first that I’m dealing with an ordinary http: page, and I absolutely want to avoid setting up my .htacess file to allow PHP parsing of HTML files (among many reasons, it cases some old browsers to attempt to download rather than display the page!). My page is for my own music, and I use php calls withing HTTP requests to allow visitors to download songs, for example like click here . Things like this work fine (In this case The PHP will find the file and initiate a download ). Now the only thing missing is that I need to be able to retrieve a simple value from the PHP call. For example if I’m checking the authorization of the visitor based on some passed cookie. Since the page itself is .html and not .PHP, the page is not going to be redisplayed, and so an ‘echo’ probably won’t work. Best thing i can think of is having the php write the results I want into a temporary file (on thye server side of course) which I could then read with a javascript XMLHttpRequest(), run within a page wide javascript intervalTimer. This sounds like an awkward rupe goldber approach though. And to make matters worse (maybe) I’m committed to learning to do things in pure PHP and javascript, without loading in jquery, ajax, or other helper libraries.

' src=

Why exactly are you using .html pages instead of .php? It seems like it would solve all of your problems just to fix that. And it’s not hard at all to do… Just rename them “.php” and add “ ” to the beginning of the document and “ ” to the end and voila! You’re done. PHP and html work perfectly together. At that point you could add whatever PHP you want to the page, just remember to start each php line with “ “.

' src=

Actually that’s exactly what Sherri was talking about.

Here is the trick :

In my php file, I put this

https://codeshare.io/507Dyn

(My code is on an external website cause I can’t write code here. It gonna expire in 24h… so please modify my reply with the code in it.

And now there is a variable called js_variable that I can use in any javascript.

Thank you all.

' src=

Is is possible to do the opposite? I’m trying to update a field in wordpress’ database on a button click. I’ve tryied somethings. But so far couldn’t make it work. Chrome didn’t allowed me to post the code here. But the answer to this question is what I’ve tryied so far. https://stackoverflow.com/questions/51372897/how-can-i-save-the-value-of-a-custom-field-to-wordpress-user-meta-after-alterin

PHP is server-side and happens before the page is rendered, so no. But you could pass the JS variable as a URL parameter or something and go to a new page or refresh the current page to get it.

' src=

Stumbled on this while looking for a package to convert php vars to js.

No clue how old this article is…but. Please don’t follow this recommendation. The second your string contains a double quote, it will break. If you want to use other types you have a world of headaches.

A better method is to json_encode the value before giving it to the js.

That may be true, but for my purposes (and likely the purposes of most of the people here), we don’t need to worry about quotes being in our variables. Generally I’m just doing something quick and easy and don’t want to go through the trouble of encoding and doing other complicated things that really aren’t necessary for what I’m doing.

I try to pass something like $array[‘info1’][‘info2’].

But it doesn’t work, my var contain a string.

Here is what I put in my js script :

var data = “”;

My php script is called in the top of the page and the javascript on the bottom.

Maybe it’s linked about what Sherri was talking about. I don’t really know. I’m not good at all at javascript.

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5 Ways To Pass PHP Variables & Arrays To Javascript

Welcome to a tutorial on how to pass PHP variables and arrays to Javascript. PHP is server-side and JavaScript is client-side, so how do we gel them together?

A quick and easy way to pass a variable from PHP to Javascript is to use the short echo tag. For example:

  • <?php $phpvar = "FOO"; ?>
  • var jsvar = "<?=$phpvar?>";

But there are more ways to do so, depending on the situation. We will walk through various examples in this guide – Read on to find out!

TABLE OF CONTENTS

Download & notes.

Here is the download link to the example code, so you don’t have to copy-paste everything.

EXAMPLE CODE DOWNLOAD

Source code on GitHub Gist

Just click on “download zip” or do a git clone. I have released it under the MIT license, so feel free to build on top of it or use it in your own project.

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PASSING PHP VARIABLES TO JAVASCRIPT

All right, let us now dive into the various ways to pass PHP variables to Javascript.

YOUTUBE TUTORIAL

EXAMPLE 1) USE PHP TO ECHO JAVASCRIPT

1a) echo javascript code.

Well, this might be a surprise for some beginners, but remember that Javascript is an interpreted language? Yes, we can use PHP to echo a block of Javascript code – It will be interpreted by the browser just fine.

1B) PHP SHORT ECHO TAG TO “INSERT VALUE “

It is a real pain to do echo "var abc = '$xyz';"; every time, so here is a quick convenience in PHP, the short echo tag <?=$PHPVAR?> . Yep, this is equivalent to doing <?php echo $PHPVAR; ?> .

EXAMPLE 2) INSERT PHP VARIABLE INTO HTML FORM

We are still using the PHP short echo tag here, but “inserting” the value into an HTML <input> field and using Javascript to get the form field. Kind of a roundabout way, but this makes sense if you are working with forms.

EXAMPLE 3) USE JSON TO PASS ARRAYS

Sadly, we cannot pass an array (or object) as it is. In this case, we can:

  • Use json_encode() in PHP to turn the array into a JSON encoded string.
  • Good old PHP short echo tag to output the string, but coupled with Javascript JSON.parse() to turn the JSON encoded string back into an array.

Quick extra note and summary:

  • JSON stands for “Javascript Standard Object Notation”. A way to represent arrays and objects as strings.
  • json_encode() turns an array into a string.
  • json_decode() turns the JSON string back to an array.
  • JSON.stringify() turns an array into a string.
  • JSON.parse() turns string back to an array.

EXAMPLE 4) AJAX TO FETCH VALUES

4a) html & javascript.

If you have not heard it, AJAX stands for “Asynchronous Javascript and XML”. In simple terms, sending or fetching data from the server without reloading the entire page. AJAX is very easy to perform, and it is probably deemed to be the most “appropriate way to pass variables”.

  • Fetch data from the PHP script – fetch(URL)
  • Then return the results as text .then(res => res.text())
  • Lastly, do whatever you need with the data .then(data => { console.log(data); })

P.S. Take extra note that AJAX will not work with file:// (directly opening the HTML file in the browser). Use a proper web server with http:// instead.

4B) SERVER-SIDE PHP

On the server-side, just do whatever PHP processing and output it, this will be picked up in the AJAX call – res => res.text() .

EXAMPLE 5) JSON & AJAX TO PASS ARRAYS

5a) html & javascript.

Still remember “AJAX fetch” from earlier? This is the same, except that we tell fetch() to parse and return the results as JSON data – .then(res => res.json()) .

5B) THE PHP

This should be self-explanatory by now, we use json_encode() to output the array as a string.

We are now done with the tutorial, and here are a few links and extras that may be useful.

LINKS & REFERENCES

  • Escaping From HTML – PHP
  • PHP Tags – PHP
  • Using The Fetch API – MDN
  • Simple PHP AJAX Examples – Code Boxx
  • JSON in PHP and JS – Code Boxx

Thank you for reading, and we have come to the end of this guide. I hope that it has helped you with your project, and if you want to share anything with this guide, please feel free to comment below. Good luck and happy coding!

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How to Pass Variable From PHP to JavaScript

  • How to Pass Variable From PHP to …

Use AJAX to Pass the PHP Variable to JavaScript

Use javascript to escape the php scripts to pass the php variable to javascript, use the short php echo tag, <=> inside the javascript to pass the php variable to javascript.

How to Pass Variable From PHP to JavaScript

We will introduce a way to pass the PHP variable to JavaScript using AJAX. This method requests the data from the PHP server and runs on the client machine.

We will also demonstrate another method to pass the PHP variable in JavaScript by escaping the PHP to JavaScript. We write JavaScript after the PHP scripts to escape the PHP.

We will show you another example to pass the PHP variable to JavaScript using the short echo tag in the JavaScript as <?=$var?> where $var is the PHP variable.

We can use AJAX to get the data and variables from the PHP server to JavaScript. This method has separate server-side and client-side scripts. It makes the code cleaner and enhances the code readability. AJAX stands for Asynchronous JavaScript and XML. It uses the XMLHttpRequest object to request the data from the server. It displays the data using JavaScript and HTML DOM. This process occurs asynchronously, which means the changes happen in the webpage without the page being reloaded. However, there is latency when AJAX is used over networks because it sends the HTTP request. In this method, we write JavaScript code in the PHP file.

For example, create a PHP file named index.php . Write the JavaScript code inside the <script> tag. Create a vairable req using the var keyword. Create a request object of the XMLHttpRequest() function and assign it to the req variable. Call the onload() function with the req object using the function expression. Inside the function, use the console.log() function to log the this.responseText property. Do not forget to end the function expression with a semicolon. Use the req object to call the open() function. Supply get , get-data.php and true simultaneously as the parameters in the function. Call the send() function with the req object. Create another PHP file named get-data.php . Assign a value of Mountain to $var variable. Echo the json_encode() function with the $var as the parameter.

In the example below, we created a request object with the XMLHttpRequest() function. The onload() function handles the operation to be performed during the response. The open() function specifies the HTTP method, the PHP file that sends the JSON response, and a boolean value that controls the rest of the execution of the script. The json_encode() function in the get-data.php file sends the response in JSON format. Here, we printed the variable $var in the console.

Example Code:

We can use JavaScript after the PHP tags to escape the PHP scripts. We can create a PHP variable in the PH P script. Then, we can write the JavaScript to escape the above-written PHP and pass the variable inside the JavaScript code. Inside the JavaScript, we can use the PHP tag to echo the PHP variable assigning it to a JavaScript variable.

For example, assign a value Metallica to a variable $var inside the PHP tags. Write a script tag and inside it, write a PHP tag. Inside the PHP tag, echo a JavaScript variable jsvar . Assign the PHP variable $var to jsvar . Do not forget a quote wrapped around the $var and a semicolon after it. Close the PHP tag and log the value of jsvar using the console.log() function. Close the script tag. In the example below, we have logged the PHP variable $var in the console using JavaScript. We can see the output in the console of the webpage.

We can use the short PHP echo tag inside the JavaScript to pass the PHP variable to JavaScript. We can use the short PHP echo tag to get rid of the hassle of writing the PHP tag and the echo statement. It is a short-hand method. This method is very much similar to the second method in terms of the concept and the execution.

For example, assign a value Megadeth to a variable $var inside the PHP tags. Open a script tag and create a JavaScript variable jsvar . Write the short-hand echo tag <?=$var?> as the value of the jsvar variable. Log the variable using the console.log() function. We can view the output of the script in the console of the webpage.

Code Example:

Subodh Poudel avatar

Subodh is a proactive software engineer, specialized in fintech industry and a writer who loves to express his software development learnings and set of skills through blogs and articles.

Home » PHP And JavaScript Exchange Variables

In this tutorial, we will learn how to pass variables from and to PHP and JavaScript. using 6 methods. 2 for passing JavaScript to PHP and 4 methods for passing PHP to JavaScript.

First: How To Pass JavaScript Variables To PHP?

Method 1: pass the javascript variable by echoing the script tag in the php file..

In Another JavaScript File:

In PHP File:

Method 2: Passing JavaScript variables Using Cookies.

I will use the js-cookie library. You can see this library documentation on the js-cookie library GitHub: at this link: https://github.com/js-cookie/js-cookie

First, you need to import the CDN link before your JavaScript code., and I want to mention that this library is not a jQuery plugin but it is recommended to put it after the jQuery script tag and before your custom code script tag.

In Another JavaScript File: (I will use jQuery)

of course, you would not remove the cookie but I wrote all cookie manipulation statements using the js-cookie library. for your reference.

Second: How To Pass PHP Variables To JavaScript?

Method 1: pass a set of php variables using php json_encode() function..

In Another JavaScript File: (I will use jQuery), I will set the content of the body to this string:

Method 2: Pass PHP variable using data attribute.

You can add to the div tag the display property and set it to none in the CSS of the class to hide the div tag, I used the bootstrap class d-none. because I use bootstrap in all of my projects.

Method 3: Pass PHP variable Using Cookies.

Import The JS-Cookie Library:

In Another JavaScript File: (I will use jQuery), of course, you would not set the cookie before you take its value using the get function of the JS-Cookie library, but I wrote all cookie manipulation statements using this Library. for your reference.

Method 4: Passing HTML Form values on a JSON Using (JSON.stringify() And serializeArray()) jQuery Functions

You can read the output of serializing array function, using nested jQuery (each) loop function.

That’s it, we learned all the major methods of exchanging variables between the back-end language PHP and the front-end language JavaScript.

Feel Free to bookmark my website to keep it as a reference for your work in the future.

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How to Pass Variables and Data from PHP to JavaScript

set javascript variable with php

As a software engineer, you may find yourself working on a project that requires you to pass data from PHP to JavaScript. This task may seem daunting, but it’s actually quite simple once you understand the basics. In this post, we will cover the different methods you can use to pass variables and data from PHP to JavaScript.

Method 1: Using Inline JavaScript

The simplest way to pass data from PHP to JavaScript is by using inline JavaScript. In this method, you can echo out the data you want to pass from PHP using the echo statement, and then assign it to a JavaScript variable.

Here’s an example:

In this example, we’re assigning the value of the PHP variable $name to a JavaScript variable named name . We’re doing this by echoing out a string of JavaScript code that sets the value of name to the value of $name .

This method is straightforward and easy to implement, but it has some downsides. For one, it can make your code harder to read and maintain, especially if you have a lot of inline JavaScript. It can also be a security risk if you’re not careful, as it can allow for cross-site scripting (XSS) attacks if you’re not sanitizing your input.

Method 2: Using JSON

Another way to pass data from PHP to JavaScript is by using JSON (JavaScript Object Notation). JSON is a lightweight data interchange format that is easy to read and write.

To use JSON, you first need to encode the data you want to pass from PHP as a JSON string using the json_encode function. Once you have the JSON string, you can then pass it to JavaScript using the json_decode function.

In this example, we’re creating an array called $data that contains some data we want to pass to JavaScript. We’re then using the json_encode function to encode the $data array as a JSON string, which we’re assigning to the $json variable. Finally, we’re echoing out a string of JavaScript code that sets the value of a JavaScript variable named data to the decoded JSON string.

This method is more secure than using inline JavaScript, as it doesn’t allow for XSS attacks. It’s also more maintainable, as you can easily add or remove data from the $data array without having to modify the JavaScript code.

Method 3: Using AJAX

If you’re working on a web application that requires dynamic updates without refreshing the page, you can use AJAX (Asynchronous JavaScript and XML) to pass data from PHP to JavaScript.

To use AJAX, you first need to create a PHP script that will return the data you want to pass to JavaScript. You can then use JavaScript to make an AJAX call to the PHP script and retrieve the data.

In this example, we’re creating the same $data array as before, but instead of echoing out a JavaScript variable, we’re using the json_encode function to encode the $data array as a JSON string and directly outputting it.

To retrieve this data in JavaScript, you can use the XMLHttpRequest object or a JavaScript library like jQuery to make an AJAX call to the PHP script and retrieve the data.

Here’s an example using jQuery:

In this example, we’re using the $.ajax function to make an AJAX call to the data.php script. When the call is successful, the success function is executed, which retrieves the data using the data parameter and assigns it to JavaScript variables.

This method is the most powerful and flexible option, as it allows for dynamic updates and can retrieve data from external sources. However, it requires more setup and knowledge of AJAX and JavaScript.

PHP to JavaScript Data Scenarios

Dynamic Web Pages: When you want to create dynamic web pages where data from PHP needs to be displayed or manipulated in real-time on the client side using JavaScript. This can include scenarios like showing live updates, charts, or user-specific data.

Form Processing: When you have a form on a webpage, and after the user submits the form, you want to use JavaScript to display a success message or handle errors without reloading the entire page. This requires transferring data from PHP (usually after form submission) to JavaScript to update the user interface.

AJAX-Driven Applications: If you’re building a web application that relies heavily on AJAX to fetch or update data without reloading the entire page, you need to pass data between PHP and JavaScript. AJAX is commonly used in scenarios like auto-suggest search, infinite scrolling, or chat applications.

Security and Data Validation: When you want to pass data to JavaScript securely, you should use techniques like JSON encoding. This is particularly important in scenarios where you need to display user-specific data or content fetched from a database without exposing it to potential security vulnerabilities like Cross-Site Scripting (XSS) attacks.

Complex Web Applications: In more complex web applications, especially those built with JavaScript frameworks like React or Angular, you may need to pass data between PHP and JavaScript for various purposes, such as pre-rendering initial page content, handling application state, or updating the user interface based on user interactions.

Passing variables and data from PHP to JavaScript may seem like a daunting task, but it’s actually quite simple once you understand the basics. In this post, we covered three methods you can use to pass data from PHP to JavaScript: using inline JavaScript, using JSON, and using AJAX.

Each method has its own benefits and drawbacks, so you should choose the one that best fits your project’s needs. Whether you’re working on a simple web page or a complex web application, understanding how to pass data between PHP and JavaScript is an essential skill for any software engineer.

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set javascript variable with php

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Supun Kavinda

Posted on Jul 13, 2019 • Originally published at groups.hyvor.com

How to create Javascript variables from PHP variables?

Sometimes, you may need to declare dynamic JS variables using PHP.

One thing you can do is to manually write the JS code as following.

But, we can create a function to do this easily with a better data types support.

This function requires an PHP array, which contains key/value pairs which are the Javascript variable name and the value. Also, this function automaically creates Javascript variables according to the data type of the PHP variable.

PHP Arrays will be converted into JSON format. If you don't need the '<script>' tags, just remove those two echo statements.

I previously published this post on PHP Group on my new website, Hyvor Groups.

Top comments (2)

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nice article, but this will only work if we are using JS in the same PHP file. What if we include the js from some other file?

supunkavinda profile image

I think you are talking about adding some PHP variables into a Javascript file. For example, you need index.js to have some dynamic variables to be set with PHP.

If it is what you meant, you can include the js file and the JS file should contain PHP in it.

This will execute the PHP code in it and echo the contents to the current PHP file. But, having PHP code inside a Javascript file is a mess, in my opinion.

If you need to use this approach, I would recommend adding those dynamic variables into your PHP file. You can use an include for this. Here's how I do that.

And, js-config.php will have something like:

If you don't need the Javascript variables (or JSON data) on the page load, the best way is to fetch the data from the server using AJAX.

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PHP Beginners

How to Set PHP Variable in JavaScript With Example

To Set PHP Variable in JavaScript, we need to define a JS variable and assign a PHP value using a PHP tag...

' src=

To Set PHP Variable in JavaScript , we need to define a JS variable and assign a PHP value using a PHP tag with single or double quotes.

How to Set PHP Variable in JavaScript With Example

Most of the time you have to set PHP variable value in JavaScript. If there is only a simple variable like a string or any integer then you can simply echo on the JS variable with a PHP tag.

For example, if you have a string value on the PHP variable and want to assign it and console it on JS.

Output: Lorem ipsum dolor sit amet

If you have any array value in PHP and you want to get that value on the same JavaScript variable then,

Output on Console: (3) [“Lorem”, “ipsum”, Array(2)] 0: “Lorem” 1: “ipsum” 2: (2) [“dolor”, “amet”]

Complete Example to Set PHP Variable in JavaScript

Here is a complete example, How to define PHP variables in JavaScript.

Pass PHP Variable as Parameter in JavaScript Function

Output: Alert 10

In this example Pass PHP Variable as Parameter in JavaScript Function,

  • First, we define a PHP integer and then we create a JS function and
  • Take the PHP variable on our JS variable.
  • Then we call that function with the JS variable as a parameter, Which alerts the addition of numbers.

I think this is the complete guide about accessing PHP variables in JavaScript and also set PHP variable value to JS variable.

We also use parseInt() to convert string to integer in JS. You also read know more from here https://www.w3schools.com/jsref/jsref_parseint.asp

Also Check and Run Live on  https://codingtasks.net/php-online-editor/

Also Check:

  • How Does JavaScript Filter Function work (Complete Guide With Example)
  • Get Selected Date From Calendar in PHP using Ajax
  • Auto Add Country Code in Input using JavaScript
  • How to Validate Date String in PHP

Happy Coding..!

' src=

Written by Bikash

5 Most Effective Ways to Optimize PHP Code For Performance

5 Most Effective Ways To Optimize PHP Code

Debugging in PHP: A Comprehensive Guide with Examples

Debugging in PHP: A Comprehensive Guide with Examples

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How to pass variables and data from PHP to JavaScript ?

set javascript variable with php

  • Install local server like XAMPP server into your system.
  • Save the file in htdocs folder using the name geeks.php
  • Start Apache server.
  • Open Browser and type localhost/geeks.php in address bar and hit Enter button.
  • It will display the result.

PHP is a server-side scripting language designed specifically for web development. You can learn PHP from the ground up by following this PHP Tutorial and PHP Examples .

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How to assign a PHP variable to JavaScript?

PHP tags with single or double quotes assign a PHP value to a JavaScript variable when setting a PHP variable. Several times you might need to put PHP variable values in JavaScript. You may easily echo on the JS variable with a PHP tag if there are only simple variables, such as a string or any integer.

Understanding the sequence of actions when you access a PHP website is necessary before passing a variable from PHP to JavaScript. To create the HTML, the PHP will first run your.php file. Your code will be delivered to the client's browser when PHP has processed it. PHP has no access to the file once it goes to the browser. JavaScript is executed after PHP because it runs within the browser.

Refer to the syntax below each method for the implementation.

You can use echo to transmit a PHP variable directly to JavaScript when both the PHP and JavaScript code are on the same page.

JavaScript variable assigns PHP echo statement. Printing the JavaScript variable gives PHP variable value.

The example works similarly to the syntax. Additionally, integer displays do not require quotes. Array display requires the json_encode function.

Sometimes after a user action, you may need PHP variables. In addition to using the echo method, you can store PHP data in HTML using the DOM tag. This approach is comparable to using echo directly but is cleaner because it outputs to the DOM rather than JavaScript variables.

DOM assigns PHP echo statement. The script reads the DOM to get the PHP variable value.

The example works similarly to the syntax. DOM assigns a string, integer, and array and displays in JavaScript.

Using Fetch API

Use the JavaScript Fetch API if you expect to keep your JavaScript code independent from your PHP template.

Similar to AJAX and XMLHTTPRequest, Fetch API is used to send an HTTP request. You can now access resources from any location on the Internet. PHP data can be retrieved from JavaScript using Fetch.

In contrast to the other two, this approach generates an HTTP request, resulting in a delay before the data fetch.

When your PHP data needs to go through complicated processing before being sent to JavaScript, it is better to use the Fetch API.

Fetch API returns JSON response from another PHP file. The outcome part can print this PHP variable value.

The program runs similarly to the syntax. The fetch callback stringifies the array data from info.php.

Using a short PHP echo tag

JavaScript variable assigns short echo tag. Displaying this variable gives PHP variable value.

The program works similarly to the echo method. The only difference is the short syntax.

Using XMLHttpRequest

To transfer variables and data from the PHP server to JavaScript, we can utilize AJAX. It improves readability and makes the code cleaner.

Due to the asynchronous nature of this procedure, the webpage updates without requiring a page reload. However, latency occurs because AJAX sends the HTTP request when utilized over a network.

XMLHttpRequest retrieves data from another PHP file. The onload function block can display the PHP variable in the response.

The example executes as in the syntax. The responseText in the onload callback displays the PHP variable from info.php.

Using PHP syntax inside script tag

JavaScript variable inside PHP syntax within the script tag contains the PHP variable value.

The program runs as per the syntax. The JavaScript variable in the PHP syntax inside the script tag functions as a normal JavaScript variable. The JavaScript variable assigns the PHP variable value.

This tutorial discussed how to assign PHP variable value as JavaScript. The echo method is simple, and you can use other methods based on the context.

Rushi Javiya

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Variables are "containers" for storing information.

Creating (Declaring) PHP Variables

In PHP, a variable starts with the $ sign, followed by the name of the variable:

In the example above, the variable $x will hold the value 5 , and the variable $y will hold the value "John" .

Note: When you assign a text value to a variable, put quotes around the value.

Note: Unlike other programming languages, PHP has no command for declaring a variable. It is created the moment you first assign a value to it.

Think of variables as containers for storing data.

A variable can have a short name (like $x and $y ) or a more descriptive name ( $age , $carname , $total_volume ).

Rules for PHP variables:

  • A variable starts with the $ sign, followed by the name of the variable
  • A variable name must start with a letter or the underscore character
  • A variable name cannot start with a number
  • A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
  • Variable names are case-sensitive ( $age and $AGE are two different variables)

Remember that PHP variable names are case-sensitive!

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Output Variables

The PHP echo statement is often used to output data to the screen.

The following example will show how to output text and a variable:

The following example will produce the same output as the example above:

The following example will output the sum of two variables:

Note: You will learn more about the echo statement and how to output data to the screen in the PHP Echo/Print chapter .

PHP is a Loosely Typed Language

In the example above, notice that we did not have to tell PHP which data type the variable is.

PHP automatically associates a data type to the variable, depending on its value. Since the data types are not set in a strict sense, you can do things like adding a string to an integer without causing an error.

In PHP 7, type declarations were added. This gives an option to specify the data type expected when declaring a function, and by enabling the strict requirement, it will throw a "Fatal Error" on a type mismatch.

You will learn more about strict and non-strict requirements, and data type declarations in the PHP Functions chapter.

Variable Types

PHP has no command for declaring a variable, and the data type depends on the value of the variable.

PHP supports the following data types:

  • Float (floating point numbers - also called double)

Get the Type

To get the data type of a variable, use the var_dump() function.

The var_dump() function returns the data type and the value:

See what var_dump() returns for other data types:

Assign String to a Variable

Assigning a string to a variable is done with the variable name followed by an equal sign and the string:

String variables can be declared either by using double or single quotes, but you should be aware of the differences. Learn more about the differences in the PHP Strings chapter .

Assign Multiple Values

You can assign the same value to multiple variables in one line:

All three variables get the value "Fruit":

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    By the time JavaScript code is executed by the browser, PHP code has already finished running on the server. However, there are ways to work around this limitation and pass data from JavaScript to PHP: Use AJAX to Pass Data from JavaScript to PHP; Use fetch API to send HTTP request; Use a Form to Pass Data from JavaScript to PHP; Conclusion

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    To Set PHP Variable in JavaScript, we need to define a JS variable and assign a PHP value using a PHP tag with single or double quotes. Most of the time you have to set PHP variable value in JavaScript. If there is only a simple variable like a string or any integer then you can simply echo on the JS variable with a PHP tag.

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    Output: PHP provides a method to set the cookie using the setCookie() method. Here, we can set the data or variable in PHP cookie and retrieve it from JavaScript using document.cookie. Steps to Run the program: Install local server like XAMPP server into your system. Save the file in htdocs folder using the name geeks.php; Start Apache server.

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    < html > < body > < h2 > Program to assign PHP variable value as JavaScript using < i > echo </ i ></ h2 > <? php $phpvar ="I am php variable"; $intval =100; $arrval =[10, 20, 30]; ?> < b id ="output"></ b > < script > const phpecho ="<?php echo $phpvar; ?>"; const intout =<? php echo $intval; ?>; const arrout =<? php echo json_encode( $arrval)...

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    1 Yes, you'd need to use Ajax.