1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.strcspn" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>strcspn</refname>
<refpurpose>Find length of initial segment not matching mask</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>strcspn</methodname>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
<methodparam><type>string</type><parameter>characters</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>offset</parameter><initializer>0</initializer></methodparam>
<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
Returns the length of the initial segment of
<parameter>string</parameter> which does <emphasis>not</emphasis>
contain any of the characters in <parameter>characters</parameter>.
</para>
<para>
If <parameter>offset</parameter> and <parameter>length</parameter>
are omitted, then all of <parameter>string</parameter> will be
examined. If they are included, then the effect will be the same as
calling <literal>strcspn(substr($string, $offset, $length),
$characters)</literal> (see <xref linkend="function.substr"/>
for more information).
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>string</parameter></term>
<listitem>
<para>
The string to examine.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>characters</parameter></term>
<listitem>
<para>
The string containing every disallowed character.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>offset</parameter></term>
<listitem>
<para>
The position in <parameter>string</parameter> to
start searching.
</para>
<para>
If <parameter>offset</parameter> is given and is non-negative,
then <function>strcspn</function> will begin
examining <parameter>string</parameter> at
the <parameter>offset</parameter>'th position. For instance, in
the string '<literal>abcdef</literal>', the character at
position <literal>0</literal> is '<literal>a</literal>', the
character at position <literal>2</literal> is
'<literal>c</literal>', and so forth.
</para>
<para>
If <parameter>offset</parameter> is given and is negative,
then <function>strcspn</function> will begin
examining <parameter>string</parameter> at
the <parameter>offset</parameter>'th position from the end
of <parameter>string</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
The length of the segment from <parameter>string</parameter>
to examine.
</para>
<para>
If <parameter>length</parameter> is given and is non-negative,
then <parameter>string</parameter> will be examined
for <parameter>length</parameter> characters after the starting
position.
</para>
<para>
If <parameter>length</parameter> is given and is negative,
then <parameter>string</parameter> will be examined from the
starting position up to <parameter>length</parameter>
characters from the end of <parameter>string</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the length of the initial segment of <parameter>string</parameter>
which consists entirely of characters <emphasis>not</emphasis> in <parameter>characters</parameter>.
</para>
<note>
<para>
When a <parameter>offset</parameter> parameter is set, the returned length
is counted starting from this position, not from the beginning of
<parameter>string</parameter>.
</para>
</note>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.4.0</entry>
<entry>
<simpara>
Prior to PHP 8.4.0, when <parameter>characters</parameter> was the empty string,
the search would incorrectly stop at the first null byte in <parameter>string</parameter>.
</simpara>
</entry>
</row>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>length</parameter> is nullable now.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example xml:id="strcspn.example">
<title><function>strcspn</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$a = strcspn('banana', 'a');
$b = strcspn('banana', 'abcd');
$c = strcspn('banana', 'z');
$d = strcspn('abcdhelloabcd', 'a', -9);
$e = strcspn('abcdhelloabcd', 'a', -9, -5);
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
int(1)
int(0)
int(6)
int(5)
int(4)
]]>
</screen>
</example>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.bin-safe;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>strspn</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
|
