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# array_diff

(PHP 4 >= 4.0.1)

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

This makes `$result` have `array ("blue");`. Multiple occurrences in $array1 are all treated the same way.

> Note: Two elements are considered equal if and only if `(string) $elem1 === (string) $elem2`. In words: when the string representation is the same.

> Note: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using `array_diff($array1[0], $array2[0]);`.

Warning
This was broken in PHP 4.0.4!

See also array_intersect().

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