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array_diff
Computes the difference of arrays
(PHP 4 >= 4.0.1, PHP 5)
array array_diff ( array array1, array array2 [, array ...] )
Examples
Example 242. 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
)
Notes
Note:
Two elements are considered equal if and only if
(string) $elem1 === (string) $elem2. In words:
when the string representation is the same.
Note:
This function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using
array_diff($array1[0], $array2[0]);.
Warning:
This was broken in PHP 4.0.4!