Computes the intersection of arrays with additional index check array_flip array_intersect_key Array Functions PHP Manual array_intersect_assoc (PHP 4 >= 4.3.0, PHP 5)array_intersect_assoc — Computes the intersection of arrays with additional index check Description array array_intersect_assoc ( array $array1 , array $array2 [, array $ ... ] ) array_intersect_assoc() returns an array containing all the values of array1 that are present in all the arguments. Note that the keys are used in the comparison unlike in array_intersect(). Parameters array1 The array with master values to check. array2 An array to compare values against. array A variable list of arrays to compare. Return Values Returns an associative array containing all the values in array1 that are present in all of the arguments. Examples Example #1 array_intersect_assoc() example <?php$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");$array2 = array("a" => "green", "yellow", "red");$result_array = array_intersect_assoc($array1, $array2);print_r($result_array);?> The above example will output: Array ( [a] => green ) In our example you see that only the pair "a" => "green" is present in both arrays and thus is returned. The value "red" is not returned because in $array1 its key is 0 while the key of "red" in $array2 is 1. The two values from the key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict type check is executed so the string representation must be the same. See Also array_intersect() array_uintersect_assoc() array_intersect_uassoc() array_uintersect_uassoc() array_diff() array_diff_assoc() array_flip array_intersect_key Array Functions PHP Manual
