1--TEST--
2Test mb_substr() function : usage variations - pass different integers to $start arg
3--SKIPIF--
4<?php
5extension_loaded('mbstring') or die('skip');
6function_exists('mb_substr') or die("skip mb_substr() is not available in this build");
7?>
8--FILE--
9<?php
10/*
11 * Test how mb_substr() behaves when passed a range of integers as $start argument
12 */
13
14echo "*** Testing mb_substr() : usage variations ***\n";
15
16mb_internal_encoding('UTF-8');
17
18$string_ascii = '+Is an English string'; //21 chars
19
20$string_mb = base64_decode('5pel5pys6Kqe44OG44Kt44K544OI44Gn44GZ44CCMDEyMzTvvJXvvJbvvJfvvJjvvJnjgII='); //21 chars
21
22/*
23 * Loop through integers as multiples of ten for $offset argument
24 * 60 is larger than *BYTE* count for $string_mb
25 */
26for ($i = -60; $i <= 60; $i += 10) {
27    if (@$a || @$b) {
28        $a = null;
29        $b = null;
30    }
31    echo "\n**-- Offset is: $i --**\n";
32    echo "-- ASCII String --\n";
33    $a = mb_substr($string_ascii, $i, 4);
34    var_dump(base64_encode($a));
35    echo "--Multibyte String --\n";
36    $b = mb_substr($string_mb, $i, 4, 'UTF-8');
37    if (strlen($a) == mb_strlen($b, 'UTF-8')) { // should return same length
38        var_dump(base64_encode($b));
39    } else {
40        echo "Difference in length of ASCII string and multibyte string\n";
41    }
42
43}
44
45echo "Done";
46?>
47--EXPECT--
48*** Testing mb_substr() : usage variations ***
49
50**-- Offset is: -60 --**
51-- ASCII String --
52string(8) "K0lzIA=="
53--Multibyte String --
54string(16) "5pel5pys6Kqe44OG"
55
56**-- Offset is: -50 --**
57-- ASCII String --
58string(8) "K0lzIA=="
59--Multibyte String --
60string(16) "5pel5pys6Kqe44OG"
61
62**-- Offset is: -40 --**
63-- ASCII String --
64string(8) "K0lzIA=="
65--Multibyte String --
66string(16) "5pel5pys6Kqe44OG"
67
68**-- Offset is: -30 --**
69-- ASCII String --
70string(8) "K0lzIA=="
71--Multibyte String --
72string(16) "5pel5pys6Kqe44OG"
73
74**-- Offset is: -20 --**
75-- ASCII String --
76string(8) "SXMgYQ=="
77--Multibyte String --
78string(16) "5pys6Kqe44OG44Kt"
79
80**-- Offset is: -10 --**
81-- ASCII String --
82string(8) "aXNoIA=="
83--Multibyte String --
84string(8) "MTIzNA=="
85
86**-- Offset is: 0 --**
87-- ASCII String --
88string(8) "K0lzIA=="
89--Multibyte String --
90string(16) "5pel5pys6Kqe44OG"
91
92**-- Offset is: 10 --**
93-- ASCII String --
94string(8) "bGlzaA=="
95--Multibyte String --
96string(8) "MDEyMw=="
97
98**-- Offset is: 20 --**
99-- ASCII String --
100string(4) "Zw=="
101--Multibyte String --
102string(4) "44CC"
103
104**-- Offset is: 30 --**
105-- ASCII String --
106string(0) ""
107--Multibyte String --
108string(0) ""
109
110**-- Offset is: 40 --**
111-- ASCII String --
112string(0) ""
113--Multibyte String --
114string(0) ""
115
116**-- Offset is: 50 --**
117-- ASCII String --
118string(0) ""
119--Multibyte String --
120string(0) ""
121
122**-- Offset is: 60 --**
123-- ASCII String --
124string(0) ""
125--Multibyte String --
126string(0) ""
127Done
128