1--TEST--
2Test array_intersect_key() function : usage variation - Passing null,unset and undefeined variable indexed array
3--FILE--
4<?php
5echo "*** Testing array_intersect_key() : usage variation ***\n";
6
7// Initialise function arguments not being substituted (if any)
8$input_array = array(0 => '0', 1 => '1' , -10 => '-10' , null => 'null');
9//get an unset variable
10$unset_var = 10;
11unset ($unset_var);
12
13$input_arrays = array(
14      'null indexed' => array(NULL => 'null 1', null => 'null 2'),
15      'undefined indexed' => array(@$undefined_var => 'undefined'),
16      'unset  indexed' => array(@$unset_var => 'unset'),
17);
18
19foreach($input_arrays as $key =>$value) {
20      echo "\n--$key--\n";
21      var_dump( array_intersect_key($input_array, $value) );
22      var_dump( array_intersect_key($value,$input_array ) );
23}
24?>
25--EXPECT--
26*** Testing array_intersect_key() : usage variation ***
27
28--null indexed--
29array(1) {
30  [""]=>
31  string(4) "null"
32}
33array(1) {
34  [""]=>
35  string(6) "null 2"
36}
37
38--undefined indexed--
39array(1) {
40  [""]=>
41  string(4) "null"
42}
43array(1) {
44  [""]=>
45  string(9) "undefined"
46}
47
48--unset  indexed--
49array(1) {
50  [""]=>
51  string(4) "null"
52}
53array(1) {
54  [""]=>
55  string(5) "unset"
56}
57