--TEST-- Test array_diff_uassoc() function : usage variation - Comparing integers and floating point numbers --FILE-- 1.00, 1.00 => 2.00, 2.00 => 3.00, 3.00 => 4.00); function key_compare_func($key1, $key2) { if ($key1 === $key2) { return 0; } return ($key1 > $key2)? 1:-1; } echo "\n-- Result of comparing integers and floating point numbers --\n"; var_dump( array_diff_uassoc($arr_default_int, $arr_float, "key_compare_func") ); var_dump( array_diff_uassoc($arr_float, $arr_default_int, "key_compare_func") ); ?> --EXPECT-- *** Testing array_diff_uassoc() : usage variation *** -- Result of comparing integers and floating point numbers -- array(0) { } array(0) { }