1--TEST--
2Test usort() function : usage variations - multi-dimensional arrays
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 * Pass a multi-dimensional array as $array_arg argument to usort()
12 * to test how array is re-ordered
13 */
14
15echo "*** Testing usort() : usage variation ***\n";
16
17function cmp_function($value1, $value2)
18{
19  if($value1 == $value2) {
20    return 0;
21  }
22  else if($value1 > $value2) {
23    return 1;
24  }
25  else {
26    return -1;
27  }
28}
29
30$array_args = array(
31  0 => array(2, 10, -1),
32  1 => array(100),
33  2 => array(),
34  3 => array(0),
35  4 => array(-1),
36  5 => array(-9, 34, 54, 0, 20),
37  6 => array(''),
38  7 => array("apple", "Apple", "APPLE", "aPPle", "aPpLe")
39);
40
41$temp_array = $array_args;
42
43echo "\n-- Pass usort() a two-dimensional array --\n";
44// sorting array_arg as whole array
45var_dump( usort($temp_array, 'cmp_function') );
46
47echo "-- Array after call to usort() --\n";
48var_dump($temp_array);
49
50echo "\n-- Pass usort() a sub-array --\n";
51var_dump( usort($array_args[5], 'cmp_function') );
52
53echo "-- Array after call to usort() --\n";
54var_dump($array_args[5]);
55?>
56===DONE===
57--EXPECT--
58*** Testing usort() : usage variation ***
59
60-- Pass usort() a two-dimensional array --
61bool(true)
62-- Array after call to usort() --
63array(8) {
64  [0]=>
65  array(0) {
66  }
67  [1]=>
68  array(1) {
69    [0]=>
70    int(-1)
71  }
72  [2]=>
73  array(1) {
74    [0]=>
75    int(0)
76  }
77  [3]=>
78  array(1) {
79    [0]=>
80    string(0) ""
81  }
82  [4]=>
83  array(1) {
84    [0]=>
85    int(100)
86  }
87  [5]=>
88  array(3) {
89    [0]=>
90    int(2)
91    [1]=>
92    int(10)
93    [2]=>
94    int(-1)
95  }
96  [6]=>
97  array(5) {
98    [0]=>
99    int(-9)
100    [1]=>
101    int(34)
102    [2]=>
103    int(54)
104    [3]=>
105    int(0)
106    [4]=>
107    int(20)
108  }
109  [7]=>
110  array(5) {
111    [0]=>
112    string(5) "apple"
113    [1]=>
114    string(5) "Apple"
115    [2]=>
116    string(5) "APPLE"
117    [3]=>
118    string(5) "aPPle"
119    [4]=>
120    string(5) "aPpLe"
121  }
122}
123
124-- Pass usort() a sub-array --
125bool(true)
126-- Array after call to usort() --
127array(5) {
128  [0]=>
129  int(-9)
130  [1]=>
131  int(0)
132  [2]=>
133  int(20)
134  [3]=>
135  int(34)
136  [4]=>
137  int(54)
138}
139===DONE===
140