array_diff()

array_diff() — Computes the difference of arrays.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

Compares array against one or more other arrays and returns the values in array that are not present in any of the other arrays.

Signature

array_diff(array $array, array ...$arrays): array

Parameters

Return value

Returns an array containing all the entries from array that are not present in any of the other arrays. Keys in the array array are preserved.

Example

A runnable snippet:

$array1 = array("a" => "green", "red", "blue", "red"); $array2 = array("b" => "green", "yellow", "red"); $result = array_diff($array1, $array2); print_r($result);

Output:

Array ( [1] => blue )

Changelog

See also

array_diff_assoc(), array_udiff(), array_intersect(), array_intersect_assoc()

All PHP 8.5 built-in functions

Reference card built from the PHP manual page array_diff() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.