configure.xml

<?xml version="1.0" encoding="utf-8"?>
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<section xml:id="mbstring.installation" xmlns="http://docbook.org/ns/docbook">
 &reftitle.install;
 <para>
 <literal>mbstring</literal> is a non-default extension. This means it
 is not enabled by default. You must explicitly enable the module with
 the <literal>configure</literal> option. See the
 <link linkend="install">Install</link> section for details.
 </para>
 <simpara>
 The following configure options are related to the
 <literal>mbstring</literal> module.
 </simpara>
 <para>
 <itemizedlist>
 <listitem>
 <para>
 <option role="configure">--enable-mbstring</option>: Enable
 <literal>mbstring</literal> functions. This option is
 required to use <literal>mbstring</literal> functions.
 </para>
 <para>
 <productname>libmbfl</productname> is necessary for <literal>mbstring</literal>.
 <productname>libmbfl</productname> is bundled with <literal>mbstring</literal>.
 Prior to PHP 7.3.0, if <productname>libmbfl</productname> is already installed on the system,
 <option role="configure">--with-libmbfl[=DIR]</option> can be specified to use 
 the installed library.
 </para>
 </listitem>
 <listitem>
 <para>
 <option role="configure">--disable-mbregex</option>: Disable
 regular expression functions with multibyte character support.
 </para>
 <para>
 <productname>Oniguruma</productname> is necessary for the regular
 expression functions with multibyte character support.
 As of PHP 7.4.0, pkg-config is used to detect the libonig library.
 Prior to PHP 7.4.0, <productname>Oniguruma</productname> was bundled with
 <literal>mbstring</literal>, but it was possible to build against an already
 installed libonig by passing <option role="configure">--with-onig[=DIR]</option>.
 </para>
 <para>
 It is possible to disable the multibyte regex backtrack
 check by specifying <option
 role="configure">--disable-mbregex-backtrack</option>.
 </para>
 </listitem>
 </itemizedlist>
 </para>
</section>
 
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