strncasecmp.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 9b68bf2b63200534e022bc65e800cae6c75abf26 Maintainer: daijie Status: ready -->
<!-- CREDITS: mowangjuanzi, Luffy -->
<refentry xml:id="function.strncasecmp" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>strncasecmp</refname>
  <refpurpose>二进制安全比较字符串开头的若干个字符（不区分大小写）</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>strncasecmp</methodname>
   <methodparam><type>string</type><parameter>string1</parameter></methodparam>
   <methodparam><type>string</type><parameter>string2</parameter></methodparam>
   <methodparam><type>int</type><parameter>length</parameter></methodparam>
  </methodsynopsis>
  <para>
   该函数与 <function>strcasecmp</function> 类似，不同之处在于可以指定两个字符串比较时使用的长度（即最大比较长度）。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string1</parameter></term>
     <listitem>
      <para>
       第一个字符串。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>string2</parameter></term>
     <listitem>
      <para>
       第二个字符串。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>length</parameter></term>
     <listitem>
      <para>
       最大比较长度。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  &strings.comparison.return;
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &standard.changelog.binary-safe-string-comparison;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>strncasecmp</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

$var1 = 'Hello John';
$var2 = 'hello Doe';
if (strncasecmp($var1, $var2, 5) === 0) {
    echo 'First 5 characters of $var1 and $var2 are equals in a case-insensitive string comparison';
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>strncmp</function></member>
    <member><function>preg_match</function></member>
    <member><function>substr_compare</function></member>
    <member><function>strcasecmp</function></member>
    <member><function>stristr</function></member>
    <member><function>substr</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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