<?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>Return width of string</refpurpose>
 </refnamediv>
   
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>mb_strwidth</methodname>
   <methodparam><type>string</type><parameter>str</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>encoding</parameter></methodparam>
  </methodsynopsis>
  <para>
   Returns the width of <type>string</type> <parameter>str</parameter>.
  </para>
  <para>
   Multi-byte characters are usually twice the width of single byte characters.
  </para>
  <para>
   <table>
    <title>Characters width</title>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>Chars</entry>
       <entry>Width</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>U+0000 - U+0019</entry>
       <entry>0</entry>
      </row>
      <row>
       <entry>U+0020 - U+1FFF</entry>
       <entry>1</entry>
      </row>
      <row>
       <entry>U+2000 - U+FF60</entry>
       <entry>2</entry>
      </row>
      <row>
       <entry>U+FF61 - U+FF9F</entry>
       <entry>1</entry>
      </row>
      <row>
       <entry>U+FFA0 -      </entry>
       <entry>2</entry>
      </row>
     </tbody>
    </tgroup>
   </table>
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>str</parameter></term>
     <listitem>
      <para>
       The <type>string</type> being decoded.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>encoding</parameter></term>
     <listitem>
      &mbstring.encoding.parameter;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The width of <type>string</type> <parameter>str</parameter>.
  </para>
 </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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