The array_diff Function

The array_diff function compares arrays and returns elements from the first array that are absent in the other passed arrays. Element keys are preserved. The first parameter is the main array, followed by arrays for comparison.

Syntax

array_diff(array1, array2, array3, ...);

Example

Compare two arrays and find elements from the first that are not in the second:

<?php
	$arr1 = [1, 2, 3, 4];
	$arr2 = [2, 4, 5];
	$res = array_diff($arr1, $arr2);
	print_r($res);
?>

Code execution result:

[0 => 1, 2 => 3]

Example

Comparison of three arrays:

<?php
	$arr1 = ['a', 'b', 'c', 'd'];
	$arr2 = ['b', 'd'];
	$arr3 = ['d', 'e'];
	$res = array_diff($arr1, $arr2, $arr3);
	print_r($res);
?>

Code execution result:

[0 => 'a', 2 => 'c']

Example

Comparison of associative arrays (keys are ignored, only values are compared):

<?php
	$arr1 = ['a' => 1, 'b' => 2, 'c' => 3];
	$arr2 = ['x' => 2, 'y' => 3];
	$res = array_diff($arr1, $arr2);
	print_r($res);
?>

Code execution result:

['a' => 1]

The array_diff Function

Syntax

Example

Example

Example

See Also