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Summary : in this tutorial, you will learn about PHP for statement to execute a block of code repeatedly.
Introduction to PHP for statement
The for statement allows you to execute a code block repeatedly. The syntax of the for statement is as follows:
How it works.
- The start is evaluated once when the loop starts.
- The condition is evaluated once in each iteration. If the condition is true , the statement in the body is executed. Otherwise, the loop ends.
- The increment expression is evaluated once after each iteration.
PHP allows you to specify multiple expressions in the start , condition , and increment of the for statement.
In addition, you can leave the start , condition , and increment empty, indicating that PHP should do nothing for that phase.
The following flowchart illustrates how the for statement works:
When you leave all three parts empty, you should use a break statement to exit the loop at some point. Otherwise, you’ll have an infinite loop:
PHP for statement example
The following shows a simple example that adds numbers from 1 to 10:
- First, initialize the $total to zero.
- Second, start the loop by setting the variable $i to 1. This initialization will be evaluated once when the loop starts.
- Third, the loop continues as long as $i is less than or equal to 10 . The expression $i <= 10 is evaluated once after every iteration.
- Fourth, the expression $i++ is evaluated after each iteration.
- Finally, the loop runs exactly 10 iterations and stops once $i becomes 11 .
Alternative syntax of the for statement
The for statement has the alternative syntax as follows:
The following script uses the alternative syntax to calculate the sum of 10 numbers from 1 to 10:
- Use the PHP for statement to execute a code block in a specified number of times.
PHP for loop
Php tutorial index.
PHP for loop is very similar to a while loop in that it continues to process a block of code until a statement becomes false, and everything is defined in a single line.
Program Output:
- Language Reference
- Control Structures
(PHP 4, PHP 5, PHP 7, PHP 8)
The foreach construct provides an easy way to iterate over arrays. foreach works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable. There are two syntaxes: foreach (iterable_expression as $value) statement foreach (iterable_expression as $key => $value) statement
The first form traverses the iterable given by iterable_expression . On each iteration, the value of the current element is assigned to $value .
The second form will additionally assign the current element's key to the $key variable on each iteration.
Note that foreach does not modify the internal array pointer, which is used by functions such as current() and key() .
It is possible to customize object iteration .
In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference . <?php $arr = array( 1 , 2 , 3 , 4 ); foreach ( $arr as & $value ) { $value = $value * 2 ; } // $arr is now array(2, 4, 6, 8) unset( $value ); // break the reference with the last element ?>
Reference of a $value and the last array element remain even after the foreach loop. It is recommended to destroy it by unset() . Otherwise you will experience the following behavior:
It is possible to iterate a constant array's value by reference: <?php foreach (array( 1 , 2 , 3 , 4 ) as & $value ) { $value = $value * 2 ; } ?>
Note : foreach does not support the ability to suppress error messages using @ .
Some more examples to demonstrate usage: <?php /* foreach example 1: value only */ $a = array( 1 , 2 , 3 , 17 ); foreach ( $a as $v ) { echo "Current value of \$a: $v .\n" ; } /* foreach example 2: value (with its manual access notation printed for illustration) */ $a = array( 1 , 2 , 3 , 17 ); $i = 0 ; /* for illustrative purposes only */ foreach ( $a as $v ) { echo "\$a[ $i ] => $v .\n" ; $i ++; } /* foreach example 3: key and value */ $a = array( "one" => 1 , "two" => 2 , "three" => 3 , "seventeen" => 17 ); foreach ( $a as $k => $v ) { echo "\$a[ $k ] => $v .\n" ; } /* foreach example 4: multi-dimensional arrays */ $a = array(); $a [ 0 ][ 0 ] = "a" ; $a [ 0 ][ 1 ] = "b" ; $a [ 1 ][ 0 ] = "y" ; $a [ 1 ][ 1 ] = "z" ; foreach ( $a as $v1 ) { foreach ( $v1 as $v2 ) { echo " $v2 \n" ; } } /* foreach example 5: dynamic arrays */ foreach (array( 1 , 2 , 3 , 4 , 5 ) as $v ) { echo " $v \n" ; } ?>
Unpacking nested arrays with list()
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
It is possible to iterate over an array of arrays and unpack the nested array into loop variables by providing a list() as the value.
The above example will output:
User Contributed Notes 2 notes
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Php advanced, mysql database, php examples, php reference, php foreach loop.
The foreach loop - Loops through a block of code for each element in an array or each property in an object.
The foreach Loop on Arrays
The most common use of the foreach loop, is to loop through the items of an array.
Loop through the items of an indexed array:
For every loop iteration, the value of the current array element is assigned to the variabe $x . The iteration continues until it reaches the last array element.
Keys and Values
The array above is an indexed array, where the first item has the key 0, the second has the key 1, and so on.
Associative arrays are different, associative arrays use named keys that you assign to them, and when looping through associative arrays, you might want to keep the key as well as the value.
This can be done by specifying both the key and value in the foreach defintition, like this:
Print both the key and the value from the $members array:
You will learn more about arrays in the PHP Arrays chapter.
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The foreach Loop on Objects
The foreach loop can also be used to loop through properties of an object:
Print the property names and values of the $myCar object:
You will learn more about objects in the PHP Objects and Classes chapter.
The break Statement
With the break statement we can stop the loop even if it has not reached the end:
Stop the loop if $x is "blue":
The continue Statement
With the continue statement we can stop the current iteration, and continue with the next:
Stop, and jump to the next iteration if $x is "blue":
Foreach Byref
When looping through the array items, any changes done to the array item will, by default, NOT affect the original array:
By default, changing an array item will not affect the original array:
BUT, by using the & character in the foreach declaration, the array item is assigned by reference , which results in any changes done to the array item will also be done to the original array:
By assigning the array items by reference , changes will affect the original array:
Alternative Syntax
The foreach loop syntax can also be written with the endforeach statement like this
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PHP for loops and counting arrays
It’s well known that calling count($array) in a for loop in PHP is slower than assigning the count to a variable and using that variable in the for loop instead. However until recently, I wasn’t aware that the assignment to a variable can be done in the for loop itself and share this here in this post.
The "wrong" way
The following example loops through an array in the variable $array:
The count() function is called on each loop which adds extra unecessary overhead. Even if the array only has a couple of items in it processing will still take longer than assigning count() to a variable.
The "right" way
Here’s one way of doing it the "right" way:
The count is now assigned to the variable $j so the function is only called once.
Another way of doing the above is like so:
The assignment $j = count($array) is part of the for loop, separated by a comma from the $i = 0 assignment. It is only called once at the start of the loop. It is not necesssarily superior to the first "right" example above but it does reduce the number of lines of code by one and means the purpose of the variable is clearly for of the loop.
Benchmarking
Out of interest I created an array with 100 elements and looped through the "wrong" way and the "right" way (and the whole thing 10,000 times for measurement purposes); the "right" way averaged about .20 seconds on my test box and the "wrong" way about .55 seconds.
Obviously these sorts of micro-optimizations aren’t really going to have much of an effect on your own website (that .20 vs .55 seconds was looping through the test 10k times, remember) but it is interesting to see the differences.
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- do-while loop
- foreach loop
- Initialization Expression : In this expression we have to initialize the loop counter to some value. for example: $num = 1;
- Test Expression : In this expression we have to test the condition. If the condition evaluates to true then we will execute the body of loop and go to update expression otherwise we will exit from the for loop. For example: $num <= 10;
- Update Expression : After executing loop body this expression increments/decrements the loop variable by some value. for example: $num += 2;
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- PHP All Exercises & Assignments
Practice your PHP skills using PHP Exercises & Assignments. Tutorials Class provides you exercises on PHP basics, variables, operators, loops, forms, and database.
Once you learn PHP, it is important to practice to understand PHP concepts. This will also help you with preparing for PHP Interview Questions.
Here, you will find a list of PHP programs, along with problem description and solution. These programs can also be used as assignments for PHP students.
Write a program to count 5 to 15 using PHP loop
Description: Write a Program to display count, from 5 to 15 using PHP loop as given below.
Rules & Hint
- You can use “for” or “while” loop
- You can use variable to initialize count
- You can use html tag for line break
View Solution/Program
5 6 7 8 9 10 11 12 13 14 15
Write a program to print “Hello World” using echo
Description: Write a program to print “Hello World” using echo only?
Conditions:
- You can not use any variable.
View Solution /Program
Hello World
Write a program to print “Hello PHP” using variable
Description: Write a program to print “Hello PHP” using php variable?
- You can not use text directly in echo but can use variable.
Write a program to print a string using echo+variable.
Description: Write a program to print “Welcome to the PHP World” using some part of the text in variable & some part directly in echo.
- You have to use a variable that contains string “PHP World”.
Welcome to the PHP World
Write a program to print two variables in single echo
Description: Write a program to print 2 php variables using single echo statement.
- First variable have text “Good Morning.”
- Second variable have text “Have a nice day!”
- Your output should be “Good morning. Have a nice day!”
- You are allowed to use only one echo statement in this program.
Good Morning. Have a nice day!
Write a program to check student grade based on marks
Description:.
Write a program to check student grade based on the marks using if-else statement.
- If marks are 60% or more, grade will be First Division.
- If marks between 45% to 59%, grade will be Second Division.
- If marks between 33% to 44%, grade will be Third Division.
- If marks are less than 33%, student will be Fail.
Click to View Solution/Program
Third Division
Write a program to show day of the week using switch
Write a program to show day of the week (for example: Monday) based on numbers using switch/case statements.
- You can pass 1 to 7 number in switch
- Day 1 will be considered as Monday
- If number is not between 1 to 7, show invalid number in default
It is Friday!
Write a factorial program using for loop in php
Write a program to calculate factorial of a number using for loop in php.
The factorial of 3 is 6
Factorial program in PHP using recursive function
Exercise Description: Write a PHP program to find factorial of a number using recursive function .
What is Recursive Function?
- A recursive function is a function that calls itself.
Write a program to create Chess board in PHP using for loop
Write a PHP program using nested for loop that creates a chess board.
- You can use html table having width=”400px” and take “30px” as cell height and width for check boxes.
Write a Program to create given pattern with * using for loop
Description: Write a Program to create following pattern using for loops:
- You can use for or while loop
- You can use multiple (nested) loop to draw above pattern
View Solution/Program using two for loops
* ** *** **** ***** ****** ******* ********
Simple Tips for PHP Beginners
When a beginner start PHP programming, he often gets some syntax errors. Sometimes these are small errors but takes a lot of time to fix. This happens when we are not familiar with the basic syntax and do small mistakes in programs. These mistakes can be avoided if you practice more and taking care of small things.
I would like to say that it is never a good idea to become smart and start copying. This will save your time but you would not be able to understand PHP syntax. Rather, Type your program and get friendly with PHP code.
Follow Simple Tips for PHP Beginners to avoid errors in Programming
- Start with simple & small programs.
- Type your PHP program code manually. Do not just Copy Paste.
- Always create a new file for new code and keep backup of old files. This will make it easy to find old programs when needed.
- Keep your PHP files in organized folders rather than keeping all files in same folder.
- Use meaningful names for PHP files or folders. Some examples are: “ variable-test.php “, “ loops.php ” etc. Do not just use “ abc.php “, “ 123.php ” or “ sample.php “
- Avoid space between file or folder names. Use hyphens (-) instead.
- Use lower case letters for file or folder names. This will help you make a consistent code
These points are not mandatory but they help you to make consistent and understandable code. Once you practice this for 20 to 30 PHP programs, you can go further with more standards.
The PHP Standard Recommendation (PSR) is a PHP specification published by the PHP Framework Interop Group.
Experiment with Basic PHP Syntax Errors
When you start PHP Programming, you may face some programming errors. These errors stops your program execution. Sometimes you quickly find your solutions while sometimes it may take long time even if there is small mistake. It is important to get familiar with Basic PHP Syntax Errors
Basic Syntax errors occurs when we do not write PHP Code correctly. We cannot avoid all those errors but we can learn from them.
Here is a working PHP Code example to output a simple line.
Output: Hello World!
It is better to experiment with PHP Basic code and see what errors happens.
- Remove semicolon from the end of second line and see what error occurs
- Remove double quote from “Hello World!” what error occurs
- Remove PHP ending statement “?>” error occurs
- Use “
- Try some space between “
Try above changes one at a time and see error. Observe What you did and what error happens.
Take care of the line number mentioned in error message. It will give you hint about the place where there is some mistake in the code.
Read Carefully Error message. Once you will understand the meaning of these basic error messages, you will be able to fix them later on easily.
Note: Most of the time error can be found in previous line instead of actual mentioned line. For example: If your program miss semicolon in line number 6, it will show error in line number 7.
Using phpinfo() – Display PHP Configuration & Modules
phpinfo() is a PHP built-in function used to display information about PHP’s configuration settings and modules.
When we install PHP, there are many additional modules also get installed. Most of them are enabled and some are disabled. These modules or extensions enhance PHP functionality. For example, the date-time extension provides some ready-made function related to date and time formatting. MySQL modules are integrated to deal with PHP Connections.
It is good to take a look on those extensions. Simply use
phpinfo() function as given below.
Example Using phpinfo() function
Write a PHP program to add two numbers
Write a program to perform sum or addition of two numbers in PHP programming. You can use PHP Variables and Operators
PHP Program to add two numbers:
Write a program to calculate electricity bill in php.
You need to write a PHP program to calculate electricity bill using if-else conditions.
- For first 50 units – Rs. 3.50/unit
- For next 100 units – Rs. 4.00/unit
- For next 100 units – Rs. 5.20/unit
- For units above 250 – Rs. 6.50/unit
- You can use conditional statements .
Write a simple calculator program in PHP using switch case
You need to write a simple calculator program in PHP using switch case.
Operations:
- Subtraction
- Multiplication
Remove specific element by value from an array in PHP?
You need to write a program in PHP to remove specific element by value from an array using PHP program.
Instructions:
- Take an array with list of month names.
- Take a variable with the name of value to be deleted.
- You can use PHP array functions or foreach loop.
Solution 1: Using array_search()
With the help of array_search() function, we can remove specific elements from an array.
array(4) { [0]=> string(3) “jan” [1]=> string(3) “feb” [3]=> string(5) “april” [4]=> string(3) “may” }
Solution 2: Using foreach()
By using foreach() loop, we can also remove specific elements from an array.
array(4) { [0]=> string(3) “jan” [1]=> string(3) “feb” [3]=> string(5) “april” [4]=> string(3) “may” }
Solution 3: Using array_diff()
With the help of array_diff() function, we also can remove specific elements from an array.
array(4) { [0]=> string(3) “jan” [1]=> string(3) “feb” [2]=> string(5) “march” [4]=> string(3) “may” }
Write a PHP program to check if a person is eligible to vote
Write a PHP program to check if a person is eligible to vote or not.
- Minimum age required for vote is 18.
- You can use PHP Functions .
- You can use Decision Making Statements .
Click to View Solution/Program.
You Are Eligible For Vote
Write a PHP program to calculate area of rectangle
Write a PHP program to calculate area of rectangle by using PHP Function.
- You must use a PHP Function .
- There should be two arguments i.e. length & width.
View Solution/Program.
Area Of Rectangle with length 2 & width 4 is 8 .
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How to Write Nested for loop in PHP (with for Loop Examples) 5 min read
In this post, we will learn about nested for loop in PHP and different ways to use them in a program.
Table of Contents
What is for loop
The for keyword indicates a loop in PHP. The for loop executes a block of statements repeatedly until the specified condition returns false.
What is Nested for loop
A nested loop is a loop within a loop, an inner loop within the body of an outer one. How this works is that the first pass of the outer loop triggers the inner loop, which executes to completion. Then the second pass of the outer loop triggers the inner loop again. This repeats until the outer loop finishes. Of course, a break within either the inner or outer loop would interrupt this process.
Nested for loop Examples
Example 1: Write a PHP script using nested for loop that creates a chess board
Example 2: Create a script to construct the following pattern, using nested for loop
Example 3: Write a program to create given pattern with * using for loop.
Example 4: write a program to create given pattern with * using for loop.
Example 5: Create A Script To Construct The Following Pattern, Using A Nested For Loop. ** * * * ** * * * * * * * * ***
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Write a PHP script that creates the following table using for loops. Add cellpadding="3px" and cellspacing="0px" to the table tag. Click me to see the solution 9. Write a PHP script using nested for loop that creates a chess board as shown below. Use table width="270px" and take 30px as cell height and width.
Syntax for (expression1, expression2, expression3) { // code block } This is how it works: expression1 is evaluated once expression2 is evaluated before each iterarion expression3 is evaluated after each iterarion Example Get your own PHP Server Print the numbers from 0 to 10: for ($x = 0; $x <= 10; $x++) { echo "The number is: $x <br>"; }
for loop with assignment in php - Stack Overflow for loop with assignment in php Ask Question Asked 10 years, 6 months ago Modified 10 years, 6 months ago Viewed 257 times Part of PHP Collective -3 When I want to iterate an array I usually do: foreach ($array as $a) { //do something with $a }
for loops are the most complex loops in PHP. They behave like their C counterparts. The syntax of a for loop is: for (expr1; expr2; expr3) statement The first expression ( expr1) is evaluated (executed) once unconditionally at the beginning of the loop. In the beginning of each iteration, expr2 is evaluated.
PHP Manual Language Reference Operators Change language: Submit a Pull Request Report a Bug Assignment Operators ¶ The basic assignment operator is "=". Your first inclination might be to think of this as "equal to". Don't. It really means that the left operand gets set to the value of the expression on the right (that is, "gets set to").
Example 1: The following code shows a simple example using for loop. PHP <?php for( $num = 0; $num < 20; $num += 5) { echo $num . "\n"; } ?> Output 0 5 10 15 Example 2: The following code shows another example of for loop. PHP <?php for( $num = 1; $num < 50; $num++) { if($num % 5 == 0) echo $num . "\n"; } ?> Output 5 10 15 20 25 30 35 40 45
Summary: in this tutorial, you will learn about PHP for statement to execute a block of code repeatedly.. Introduction to PHP for statement. The for statement allows you to execute a code block repeatedly. The syntax of the for statement is as follows: <?php for (start; condition; increment) { statement; } Code language: HTML, XML (xml). How it works. The start is evaluated once when the loop ...
PHP for loop is a powerful feature that allows you to execute a block of code repeatedly until a certain condition is met. In this tutorial, you will learn how to use PHP for loop with examples and exercises. You will also see how PHP for loop differs from other programming languages such as Python, Java, and C.
Here, you will find Assignments & Exercises related to PHP Loops. Once you learn PHP Loops, it is important to practice on these to understand concepts well. These PHP Loop exercises contain programs on PHP for Loop, while Loop, mathematical series, and various string pattern designs. All PHP exercises are available in the form of PHP problem ...
The foreach construct provides an easy way to iterate over arrays. foreach works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable. There are two syntaxes:
The foreach loop - Loops through a block of code for each element in an array or each property in an object. The foreach Loop on Arrays The most common use of the foreach loop, is to loop through the items of an array. Example Get your own PHP Server Loop through the items of an indexed array:
The for loop continued to iterate until it no longer matched the condition within the for loops parenthesis. The value of x is 1. The value of x is 2. Skipping. The value of x is 4. The value of x is 5. Conclusion. You will likely find yourself using for loops a lot in PHP programming, so they are incredibly important to understand. I hope that ...
Benchmarking. Out of interest I created an array with 100 elements and looped through the "wrong" way and the "right" way (and the whole thing 10,000 times for measurement purposes); the "right" way averaged about .20 seconds on my test box and the "wrong" way about .55 seconds.
The php for loop is similar to the java/C/C++ for loop. The parameters of for loop have the following meanings: initialization - Initialize the loop counter value. The initial value of the for loop is done only once. This parameter is optional. condition - Evaluate each iteration value. The loop continuously executes until the condition is false.
Syntax : for (initialization expression; test condition; update expression) { // code to be executed } In for loop, a loop variable is used to control the loop. First initialize this loop variable to some value, then check whether this variable is less than or greater than counter value.
Description: Write a Program to display count, from 5 to 15 using PHP loop as given below. Rules & Hint You can use "for" or "while" loop You can use variable to initialize count You can use html tag for line break View Solution/Program <?php $count = 5; while($count <= 15) { echo $count; echo "<br>" ; $count++; } ?> Tutorials Class - Output Window
1 2 3 4 5 6 for (initializer; condition; iterator) { //code block } What is Nested for loop A nested loop is a loop within a loop, an inner loop within the body of an outer one. How this works is that the first pass of the outer loop triggers the inner loop, which executes to completion.
TxDOT's closures at the Loop 1604 and I-10 interchange will run from 9 p.m. Thursday, Feb. 22, 2024, to 5 a.m. Friday, Feb. 23, 2024. San Antonio Express-News Hearst Newspapers Logo Skip to main ...
How to assign PHP variables from foreach loop output? Ask Question Asked 9 years, 9 months ago Modified 3 years, 10 months ago Viewed 14k times Part of PHP Collective 0 I have a foreach loop which prints out the usernames of all entries in a database table like so: foreach ($results as $result) { echo $result->username; echo '<br>'; }
1 I have a for loop that writes the results of a query into a table. I have a variable ( $rID_s) that is being assigned from a value in the query. For some reason, it omits the first iteration. I have a variable for the total rows of the query and it is assigning the correct number.