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<h2 class="title">Installation</h2>
<p class="para">
<em>mbstring</em> is a non-default extension. This means it
is not enabled by default. You must explicitly enable the module with
the <em>configure</em> option. See the
<a href="install.html" class="link">Install</a> section for details.
</p>
<p class="simpara">
The following configure options are related to the
<em>mbstring</em> module.
</p>
<p class="para">
<ul class="itemizedlist">
<li class="listitem">
<p class="para">
<strong class="option configure">--enable-mbstring</strong>
: Enable
<em>mbstring</em> functions. This option is
required to use <em>mbstring</em> functions.
</p>
<p class="para">
<span class="productname">libmbfl</span> is necessary for <em>mbstring</em>.
<span class="productname">libmbfl</span> is bundled with <em>mbstring</em>.
Before PHP 7.3.0, if <span class="productname">libmbfl</span> is already installed on the system,
<strong class="option configure">--with-libmbfl[=DIR]</strong>
can be specified to use
the installed library.
</p>
</li>
<li class="listitem">
<p class="para">
<strong class="option configure">--disable-mbregex</strong>
: Disable
regular expression functions with multibyte character support.
</p>
<p class="para">
<span class="productname">Oniguruma</span> is necessary for the regular
expression functions with multibyte character support.
<span class="productname">Oniguruma</span> is bundled with
<em>mbstring</em>. As of PHP 5.4.0, if
<span class="productname">Oniguruma</span> is already installed on the system,
<strong class="option configure">--with-onig[=DIR]</strong>
can be specified to
use the installed library.
</p>
<p class="para">
As of PHP 5.4.0 it is possible to disable the multibyte regex backtrack
check by specifying <strong class="option configure">--disable-mbregex-backtrack</strong>
.
</p>
</li>
</ul>
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