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(PHP 4 >= 4.0.1, PHP 5)

array_diff -- Computes the difference of arrays

Description

array array_diff ( array array1, array array2 [, array ...] )

array_diff() returns an array containing all the values of array1 that are not present in any of the other arguments. Note that keys are preserved.

Example 1. array_diff() example

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

print_r($result);
?>

Multiple occurrences in $array1 are all treated the same way. This will output :

Array
(
    [1] => blue
)

Warning

This was broken in PHP 4.0.4!

Related Function(s)

array_diff_assoc()

array_intersect()

array_intersect_assoc()