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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.4 $ -->
<!-- splitted from ./en/functions/gmp.xml, last change in rev 1.1 -->
<refentry id="function.gmp-invert">
<refnamediv>
<refname>gmp_invert</refname>
<refpurpose>Inverse by modulo</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>resource</type><methodname>gmp_invert</methodname>
<methodparam><type>resource</type><parameter>a</parameter></methodparam>
<methodparam><type>resource</type><parameter>b</parameter></methodparam>
</methodsynopsis>
<para>
Computes the inverse of <parameter>a</parameter> modulo
<parameter>b</parameter>. Returns &false; if an inverse does not
exist.
</para>
<example>
<title><function>gmp_invert</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
echo gmp_invert("5", "10"); // no inverse, outputs nothing, result is FALSE
$invert = gmp_invert("5", "11");
echo gmp_strval($invert) . "\n";
?>
]]>
</programlisting>
<para>
The printout of the above program will be:
</para>
<screen>
<![CDATA[
9
]]>
</screen>
</example>
</refsect1>
</refentry>
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