chunk-split.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.chunk-split" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>chunk_split</refname>
  <refpurpose>将字符串分割成小块</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>chunk_split</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>76</initializer></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>separator</parameter><initializer>"\r\n"</initializer></methodparam>
  </methodsynopsis>
  <para>
   使用此函数将字符串分割成小块非常有用。例如将
   <function>base64_encode</function> 的输出转换成符合 RFC 2045 语义的字符串。它会在每
   <parameter>length</parameter> 个字符后边插入
   <parameter>separator</parameter>。
  </para>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       要分割的字符。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>length</parameter></term>
     <listitem>
      <para>
       分割的尺寸。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>separator</parameter></term>
     <listitem>
      <para>
       行尾序列符号。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回分割后的字符。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>chunk_split</function>  例子</title>
    <programlisting role="php">
<![CDATA[
<?php
// 使用 RFC 2045 语义格式化 $data
$new_string = chunk_split(base64_encode($data));
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>str_split</function></member>
    <member><function>explode</function></member>
    <member><function>wordwrap</function></member>
    <member><link xlink:href="&url.rfc;2045">RFC 2045</link></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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