array_udiff_uassoc Computes the difference of arrays with additional index check, compares data and indexes by a callback function &reftitle.description; arrayarray_udiff_uassoc arrayarray1 arrayarray2 array ... callabledata_compare_func callablekey_compare_func Computes the difference of arrays with additional index check, compares data and indexes by a callback function. Note that the keys are used in the comparison unlike array_diff and array_udiff. &reftitle.parameters; array1 The first array. array2 The second array. data_compare_func &return.callbacksort; &callback.cmp; key_compare_func The comparison of keys (indices) is done also by the callback function key_compare_func. This behaviour is unlike what array_udiff_assoc does, since the latter compares the indices by using an internal function. &reftitle.returnvalues; Returns an array containing all the values from array1 that are not present in any of the other arguments. &reftitle.examples; priv_member = $val; } static function comp_func_cr($a, $b) { if ($a->priv_member === $b->priv_member) return 0; return ($a->priv_member > $b->priv_member)? 1:-1; } static function comp_func_key($a, $b) { if ($a === $b) return 0; return ($a > $b)? 1:-1; } } $a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),); $b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),); $result = array_udiff_uassoc($a, $b, array("cr", "comp_func_cr"), array("cr", "comp_func_key")); print_r($result); ?> ]]> &example.outputs; cr Object ( [priv_member:private] => 9 ) [0.5] => cr Object ( [priv_member:private] => 12 ) [0] => cr Object ( [priv_member:private] => 23 ) ) ]]> In our example above you see the "1" => new cr(4) pair is present in both arrays and thus it is not in the output from the function. Keep in mind that you have to supply 2 callback functions. &reftitle.notes; Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_udiff_uassoc($array1[0], $array2[0], "data_compare_func", "key_compare_func");. &reftitle.seealso; array_diff array_diff_assoc array_udiff array_udiff_assoc array_intersect array_intersect_assoc array_uintersect array_uintersect_assoc array_uintersect_uassoc