Computes the difference of arrays array_diff_ukey array_fill_keys Array Functions PHP Manual array_diff (PHP 4 >= 4.0.1, PHP 5)array_diff — Computes the difference of arrays Description array array_diff ( array $array1 , array $array2 [, array $ ... ] ) Compares array1 against array2 and returns the difference. Parameters array1 The array to compare from array2 An array to compare against ... More arrays to compare against Return Values Returns an array containing all the entries from array1 that are not present in any of the other arrays. Examples 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 ) 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! See Also array_diff_assoc() array_intersect() array_intersect_assoc() array_diff_ukey array_fill_keys Array Functions PHP Manual
