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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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