1--TEST--
2Test usort() function : basic functionality
3--FILE--
4<?php
5/* Prototype  : bool usort(array $array_arg, string $cmp_function)
6 * Description: Sort an array by values using a user-defined comparison function
7 * Source code: ext/standard/array.c
8 */
9
10/*
11 * Test basic functionality of usort() with indexed and associative arrays
12 */
13
14echo "*** Testing usort() : basic functionality ***\n";
15
16function cmp($value1, $value2)
17{
18  if($value1 == $value2) {
19    return 0;
20  }
21  else if($value1 > $value2) {
22    return 1;
23  }
24  else
25    return -1;
26}
27
28// Int array with default keys
29$int_values = array(1, 8, 9, 3, 2, 6, 7);
30
31echo "\n-- Numeric array with default keys --\n";
32var_dump( usort($int_values, 'cmp') );
33var_dump($int_values);
34
35// String array with default keys
36$string_values = array("This", "is", 'a', "test");
37
38echo "\n-- String array with default keys --\n";
39var_dump( usort($string_values, 'cmp') );
40var_dump($string_values);
41
42// Associative array with numeric keys
43$numeric_key_arg = array(1=> 1, 2 => 2, 3 => 7, 5 => 4, 4 => 9);
44
45echo "\n-- Associative array with numeric keys --\n";
46var_dump( usort($numeric_key_arg, 'cmp') );
47var_dump($numeric_key_arg);
48
49// Associative array with string keys
50$string_key_arg = array('one' => 4, 'two' => 2, 'three' => 1, 'four' => 10);
51
52echo "\n-- Associative array with string keys --\n";
53var_dump( usort($string_key_arg, 'cmp') );
54var_dump($string_key_arg);
55?>
56===DONE===
57--EXPECT--
58*** Testing usort() : basic functionality ***
59
60-- Numeric array with default keys --
61bool(true)
62array(7) {
63  [0]=>
64  int(1)
65  [1]=>
66  int(2)
67  [2]=>
68  int(3)
69  [3]=>
70  int(6)
71  [4]=>
72  int(7)
73  [5]=>
74  int(8)
75  [6]=>
76  int(9)
77}
78
79-- String array with default keys --
80bool(true)
81array(4) {
82  [0]=>
83  string(4) "This"
84  [1]=>
85  string(1) "a"
86  [2]=>
87  string(2) "is"
88  [3]=>
89  string(4) "test"
90}
91
92-- Associative array with numeric keys --
93bool(true)
94array(5) {
95  [0]=>
96  int(1)
97  [1]=>
98  int(2)
99  [2]=>
100  int(4)
101  [3]=>
102  int(7)
103  [4]=>
104  int(9)
105}
106
107-- Associative array with string keys --
108bool(true)
109array(4) {
110  [0]=>
111  int(1)
112  [1]=>
113  int(2)
114  [2]=>
115  int(4)
116  [3]=>
117  int(10)
118}
119===DONE===
120