The Foreach Construct

The foreach construct allows you to sequentially iterate over array elements. It works with arrays and objects that implement the Traversable interface. There are two syntax variants: for iterating over values only and for iterating over keys and values.

Syntax

foreach (array as $value) {
	// loop body
}

foreach (array as $key => $value) {
	// loop body
}

Example

Simple iteration over array elements:

<?php
	$arr = [1, 2, 3, 4, 5];
	
	foreach ($arr as $value) {
		echo $value . '<br>';
	}
?>

Code execution result:

Example

Iterating over an array with getting keys and values:

<?php
	$arr = ['a' => 1, 'b' => 2, 'c' => 3];
	
	foreach ($arr as $key => $value) {
		echo "$key: $value<br>";
	}
?>

Code execution result:

a: 1
b: 2
c: 3

Example

Using a reference to modify array elements:

<?php
	$arr = [1, 2, 3, 4, 5];
	foreach ($arr as &$value) {
		$value *= 2;
	}
	
	unset($value);
	print_r($arr);
?>

Code execution result:

[2, 4, 6, 8, 10]

The Foreach Construct

Syntax

Example

Example

Example

See Also