--TEST-- Test array_diff_uassoc() function : usage variation -Passing classWithoutToString (handling fatal error) to callback --FILE-- "green", "b" => "brown", "c" => "blue", "red"); $array2 = array("a" => "green", "yellow", "red"); class classWithoutToString { } // Define error handler function test_error_handler($err_no, $err_msg, $filename, $linenum, $vars) { if (error_reporting() != 0) { // report non-silenced errors echo "Error: $err_no - $err_msg, $filename($linenum)\n"; } } set_error_handler('test_error_handler'); $value = new classWithoutToString(); var_dump( array_diff_uassoc($array1, $array2, $value) ); ?> ===DONE=== --EXPECTF-- *** Testing array_diff_uassoc() : usage variation *** Error: 2 - array_diff_uassoc() expects parameter 3 to be a valid callback, no array or string given, %s(%d) NULL ===DONE===