archived-doc-zh/reference/mbstring/functions/mb-strwidth.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mb-strwidth" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>mb_strwidth</refname>
  <refpurpose>返回字符串的宽度</refpurpose>
 </refnamediv>
   
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>mb_strwidth</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>
   返回 <type>string</type> 类型 <parameter>string</parameter> 的宽度，其中半角字符计为 <literal>1</literal>，全角字符计为
   <literal>2</literal>。有关东亚字符宽度的详细信息，请参见 <link xlink:href="&url.unicode.reports.tr;11/">&url.unicode.reports.tr;11/</link>。
  </para>
  <para>
   全角字符是：
   <literal>U+1100</literal>-<literal>U+115F</literal>,
   <literal>U+11A3</literal>-<literal>U+11A7</literal>,
   <literal>U+11FA</literal>-<literal>U+11FF</literal>,
   <literal>U+2329</literal>-<literal>U+232A</literal>,
   <literal>U+2E80</literal>-<literal>U+2E99</literal>,
   <literal>U+2E9B</literal>-<literal>U+2EF3</literal>,
   <literal>U+2F00</literal>-<literal>U+2FD5</literal>,
   <literal>U+2FF0</literal>-<literal>U+2FFB</literal>,
   <literal>U+3000</literal>-<literal>U+303E</literal>,
   <literal>U+3041</literal>-<literal>U+3096</literal>,
   <literal>U+3099</literal>-<literal>U+30FF</literal>,
   <literal>U+3105</literal>-<literal>U+312D</literal>,
   <literal>U+3131</literal>-<literal>U+318E</literal>,
   <literal>U+3190</literal>-<literal>U+31BA</literal>,
   <literal>U+31C0</literal>-<literal>U+31E3</literal>,
   <literal>U+31F0</literal>-<literal>U+321E</literal>,
   <literal>U+3220</literal>-<literal>U+3247</literal>,
   <literal>U+3250</literal>-<literal>U+32FE</literal>,
   <literal>U+3300</literal>-<literal>U+4DBF</literal>,
   <literal>U+4E00</literal>-<literal>U+A48C</literal>,
   <literal>U+A490</literal>-<literal>U+A4C6</literal>,
   <literal>U+A960</literal>-<literal>U+A97C</literal>,
   <literal>U+AC00</literal>-<literal>U+D7A3</literal>,
   <literal>U+D7B0</literal>-<literal>U+D7C6</literal>,
   <literal>U+D7CB</literal>-<literal>U+D7FB</literal>,
   <literal>U+F900</literal>-<literal>U+FAFF</literal>,
   <literal>U+FE10</literal>-<literal>U+FE19</literal>,
   <literal>U+FE30</literal>-<literal>U+FE52</literal>,
   <literal>U+FE54</literal>-<literal>U+FE66</literal>,
   <literal>U+FE68</literal>-<literal>U+FE6B</literal>,
   <literal>U+FF01</literal>-<literal>U+FF60</literal>,
   <literal>U+FFE0</literal>-<literal>U+FFE6</literal>,
   <literal>U+1B000</literal>-<literal>U+1B001</literal>,
   <literal>U+1F200</literal>-<literal>U+1F202</literal>,
   <literal>U+1F210</literal>-<literal>U+1F23A</literal>,
   <literal>U+1F240</literal>-<literal>U+1F248</literal>,
   <literal>U+1F250</literal>-<literal>U+1F251</literal>,
   <literal>U+20000</literal>-<literal>U+2FFFD</literal>,
   <literal>U+30000</literal>-<literal>U+3FFFD</literal>。
   其它所有字符都是半角字符。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       待解码的 <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>
   <type>string</type> <parameter>string</parameter> 的宽度。
  </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="examples">
  &reftitle.examples;
  <example xml:id="mb-strwidth.example.basic">
   <title><function>mb_strwidth</function> 示例</title>
   <programlisting role="php">
<![CDATA[
<?php
var_dump(
    mb_strwidth('a'),       // 拉丁文小写字母 A
    mb_strwidth("\u{ff41}") // 全角拉丁文小写字母 A
);
?>
]]>
   </programlisting>
   &example.outputs;
   <screen>
<![CDATA[
int(1)
int(2)
]]>
   </screen>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mb_strimwidth</function></member>
    <member><function>mb_internal_encoding</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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