xref: /PHP-8.2/ext/standard/tests/strings/substr.phpt (revision ea256a21)
1--TEST--
2Testing substr() function
3--FILE--
4<?php
5
6$strings_array = array( "", 12345, "abcdef", "123abc", "_123abc");
7
8$counter = 1;
9foreach ($strings_array as $str) {
10  /* variations with two arguments */
11  /* start values >, < and = 0    */
12
13  echo ("\n--- Iteration ".$counter." ---\n");
14  echo ("\n-- Variations for two arguments --\n");
15  var_dump ( substr($str, 1) );
16  var_dump ( substr($str, 0) );
17  var_dump ( substr($str, -2) );
18
19  /* variations with three arguments */
20  /* start value variations with length values  */
21
22  echo ("\n-- Variations for three arguments --\n");
23  var_dump ( substr($str, 1, 3) );
24  var_dump ( substr($str, 1, 0) );
25  var_dump ( substr($str, 1, -3) );
26  var_dump ( substr($str, 0, 3) );
27  var_dump ( substr($str, 0, 0) );
28  var_dump ( substr($str, 0, -3) );
29  var_dump ( substr($str, -2, 3) );
30  var_dump ( substr($str, -2, 0 ) );
31  var_dump ( substr($str, -2, -3) );
32
33  $counter++;
34}
35
36/* variation of start and length to point to same element */
37echo ("\n*** Testing for variations of start and length to point to same element ***\n");
38var_dump (substr("abcde" , 2, -2) );
39var_dump (substr("abcde" , -3, -2) );
40
41/* Testing to return empty string when start denotes the position beyond the truncation (set by negative length) */
42echo ("\n*** Testing for start > truncation  ***\n");
43var_dump (substr("abcdef" , 4, -4) );
44
45/* String with null character */
46echo ("\n*** Testing for string with null characters ***\n");
47var_dump (substr("abc\x0xy\x0z" ,2) );
48
49/* String with international characters */
50echo ("\n*** Testing for string with international characters ***\n");
51var_dump (substr('\xIñtërnâtiônàlizætiøn',3) );
52
53/* start <0 && -start > length */
54echo "\n*** Start before the first char ***\n";
55var_dump (substr("abcd" , -8) );
56
57/* Omitting length and passing a NULL length */
58echo "\n*** Omitting length or using NULL length ***\n";
59var_dump (substr("abcdef" , 2) );
60var_dump (substr("abcdef" , 2, NULL) );
61
62echo"\nDone";
63
64?>
65--EXPECTF--
66--- Iteration 1 ---
67
68-- Variations for two arguments --
69string(0) ""
70string(0) ""
71string(0) ""
72
73-- Variations for three arguments --
74string(0) ""
75string(0) ""
76string(0) ""
77string(0) ""
78string(0) ""
79string(0) ""
80string(0) ""
81string(0) ""
82string(0) ""
83
84--- Iteration 2 ---
85
86-- Variations for two arguments --
87string(4) "2345"
88string(5) "12345"
89string(2) "45"
90
91-- Variations for three arguments --
92string(3) "234"
93string(0) ""
94string(1) "2"
95string(3) "123"
96string(0) ""
97string(2) "12"
98string(2) "45"
99string(0) ""
100string(0) ""
101
102--- Iteration 3 ---
103
104-- Variations for two arguments --
105string(5) "bcdef"
106string(6) "abcdef"
107string(2) "ef"
108
109-- Variations for three arguments --
110string(3) "bcd"
111string(0) ""
112string(2) "bc"
113string(3) "abc"
114string(0) ""
115string(3) "abc"
116string(2) "ef"
117string(0) ""
118string(0) ""
119
120--- Iteration 4 ---
121
122-- Variations for two arguments --
123string(5) "23abc"
124string(6) "123abc"
125string(2) "bc"
126
127-- Variations for three arguments --
128string(3) "23a"
129string(0) ""
130string(2) "23"
131string(3) "123"
132string(0) ""
133string(3) "123"
134string(2) "bc"
135string(0) ""
136string(0) ""
137
138--- Iteration 5 ---
139
140-- Variations for two arguments --
141string(6) "123abc"
142string(7) "_123abc"
143string(2) "bc"
144
145-- Variations for three arguments --
146string(3) "123"
147string(0) ""
148string(3) "123"
149string(3) "_12"
150string(0) ""
151string(4) "_123"
152string(2) "bc"
153string(0) ""
154string(0) ""
155
156*** Testing for variations of start and length to point to same element ***
157string(1) "c"
158string(1) "c"
159
160*** Testing for start > truncation  ***
161string(0) ""
162
163*** Testing for string with null characters ***
164string(6) "c%0xy%0z"
165
166*** Testing for string with international characters ***
167string(26) "ñtërnâtiônàlizætiøn"
168
169*** Start before the first char ***
170string(4) "abcd"
171
172*** Omitting length or using NULL length ***
173string(4) "cdef"
174string(4) "cdef"
175
176Done
177