1--TEST--
2array_diff_ukey() : Basic test.
3--FILE--
4<?php
5/*
6* proto array array_diff_ukey ( array $array1, array $array2 [, array $ ..., callback $key_compare_func] )
7* Function is implemented in ext/standard/array.c
8*/
9function key_compare_func($key1, $key2) {
10    if ($key1 == $key2) return 0;
11    else if ($key1 > $key2) return 1;
12    else return -1;
13}
14$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
15$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
16var_dump(array_diff_ukey($array1, $array2, 'key_compare_func'));
17?>
18--EXPECT--
19array(2) {
20  ["red"]=>
21  int(2)
22  ["purple"]=>
23  int(4)
24}
25