array_intersect_assoc Computes the intersection of arrays with additional index check &reftitle.description; arrayarray_intersect_assoc arrayarray1 arrayarray2 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. &reftitle.parameters; array1 The array with master values to check. array2 An array to compare values against. array A variable list of arrays to compare. &reftitle.returnvalues; Returns an associative array containing all the values in array1 that are present in all of the arguments. &reftitle.examples; "green", "b" => "brown", "c" => "blue", "red"); $array2 = array("a" => "green", "yellow", "red"); $result_array = array_intersect_assoc($array1, $array2); print_r($result_array); ?> ]]> &example.outputs; 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. &reftitle.seealso; array_intersect array_uintersect_assoc array_intersect_uassoc array_uintersect_uassoc array_diff array_diff_assoc