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.
<?php
$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.
Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.
Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $array2[0]);.
This was broken in PHP 4.0.4!
See also array_diff_assoc(), array_intersect(), and array_intersect_assoc().
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