archived-doc-zh/reference/strings/functions/str-split.xml

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<refentry xml:id="function.str-split" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>str_split</refname>
  <refpurpose>将字符串转换为数组</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>str_split</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>1</initializer></methodparam>
  </methodsynopsis>
  <para>
   将一个字符串转换为数组。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       输入字符串。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>length</parameter></term>
     <listitem>
      <para>
       每一段的长度。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   如果指定了可选的 <parameter>length</parameter> 参数，返回数组中的每个元素长度均为 <parameter>length</parameter>
   的块，除了最后一个块，如果字符串不是均匀划分，则可能会更短。默认 <parameter>length</parameter> 是
   <literal>1</literal>，这意味着每个块的大小是一个字节。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   如果 <parameter>length</parameter> 小于 <literal>1</literal>，将会抛出 <classname>ValueError</classname>。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.2.0</entry>
      <entry>
       如果 <parameter>string</parameter> 为空，现在返回空 &array;。之前返回的 &array; 包含单个空字符串。
      </entry>
     </row>
     <row>
      <entry>8.0.0</entry>
      <entry>
       如果 <parameter>length</parameter> 小于 <literal>1</literal>，现在会抛出
       <classname>ValueError</classname>；之前会触发 <constant>E_WARNING</constant>
       级别的错误且函数会返回 &false;。
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

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

$str = "Hello Friend";

$arr1 = str_split($str);
$arr2 = str_split($str, 3);

print_r($arr1);
print_r($arr2);

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] =>
    [6] => F
    [7] => r
    [8] => i
    [9] => e
    [10] => n
    [11] => d
)

Array
(
    [0] => Hel
    [1] => lo
    [2] => Fri
    [3] => end
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    处理多字节编码字符串时，<function>str_split</function> 将拆分为字节，而不是字符。<function>mb_str_split</function>
    可用于将字符串拆分为码点。<function>grapheme_str_split</function> 可用于将字符串拆分为字素簇。
   </para>
  </note>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mb_str_split</function></member>
    <member><function>grapheme_str_split</function></member>
    <member><function>chunk_split</function></member>
    <member><function>preg_split</function></member>
    <member><function>explode</function></member>
    <member><function>count_chars</function></member>
    <member><function>str_word_count</function></member>
    <member><link linkend="control-structures.for">for</link></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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