<?xml version="1.0" encoding="utf-8"?>

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<refentry xml:id="function.mb-strlen" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">

<refnamediv>

<refname>mb_strlen</refname>

<refpurpose>获取字符串的长度</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type>int</type><methodname>mb_strlen</methodname>

<methodparam><type>string</type><parameter>string</parameter></methodparam>

<methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>encoding</parameter><initializer>&null;</initializer></methodparam>

</methodsynopsis>

<para>

获取一个 <type>string</type> 的长度。

</para>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>string</parameter></term>

<listitem>

<para>

要检查长度的 <type>string</type>。

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><parameter>encoding</parameter></term>

<listitem>

&mbstring.encoding.parameter;

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

返回具有 <parameter>encoding</parameter> 编码的 <type>string</type> <parameter>string</parameter> 包含的字符数。

多字节的字符被计为 1。

</para>

</refsect1>

<refsect1 role="errors">

&reftitle.errors;

<para>

如果 encoding 未知，则会生成 <constant>E_WARNING</constant> 级别的错误。

</para>

</refsect1>

<refsect1 role="changelog">

&reftitle.changelog;

<informaltable>

<tgroup cols="2">

<thead>

<row>

<entry>&Version;</entry>

<entry>&Description;</entry>

</row>

</thead>

<tbody>

&mbstring.changelog.encoding-nullable;

</tbody>

</tgroup>

</informaltable>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<para>

<simplelist>

<member><function>mb_internal_encoding</function></member>

<member><function>grapheme_strlen</function></member>

<member><function>iconv_strlen</function></member>

<member><function>strlen</function></member>

</simplelist>

</para>

</refsect1>

</refentry>

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