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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@81330 c90b9560-bf6c-de11-be94-00142212c4b1
136 lines
3.6 KiB
XML
136 lines
3.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.3 $ -->
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<reference id="ref.gmp">
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<title>GMP functions</title>
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<titleabbrev>GMP</titleabbrev>
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<partintro>
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<section id="gmp.intro">
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&reftitle.intro;
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<simpara>
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These functions allow you to work with arbitrary-length integers
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using the GNU <acronym>MP</acronym> library.
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</simpara>
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<simpara>
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These functions have been added in PHP 4.0.4.
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</simpara>
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<note>
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<para>
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Most GMP functions accept GMP number arguments, defined as
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<literal>resource</literal> below. However, most of these
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functions will also accept numeric and string arguments, given
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that it is possible to convert the latter to a number. Also,
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if there is a faster function that can operate on integer arguments,
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it would be used instead of the slower function when the supplied arguments are
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integers. This is done transparently, so the bottom line is that
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you can use integers in every function that expects GMP
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number. See also the <function>gmp_init</function> function.
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</para>
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</note>
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<warning>
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<simpara>
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If you want to explicitly specify a large integer,
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specify it as a string. If you don't do that, PHP will
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interpret the integer-literal first, possibly resulting
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in loss of precision, even before <literal>GMP</literal>
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comes into play.
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</simpara>
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</warning>
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</section>
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<section id="gmp.requirenments">
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&reftitle.required;
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<para>
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You can download the <acronym>GMP</acronym> library from <ulink
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url="&url.gmp;">&url.gmp;</ulink>. This site also has the
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<acronym>GMP</acronym> manual available.
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</para>
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<simpara>
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You will need GMP version 2 or better to use these functions. Some
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functions may require more recent version of the GMP library.
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</simpara>
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</section>
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<section id="gmp.installation">
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&reftitle.install;
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<para>
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In order to have these functions available, you must compile PHP with
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<acronym>GMP</acronym> support by using the <option
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role="configure">--with-gmp</option> option.
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</para>
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</section>
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<section id="gmp.configuration">
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&reftitle.runtime;
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&no.config;
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</section>
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<section id="gmp.resources">
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&reftitle.resources;
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&no.resource;
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</section>
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&reference.gmp.constants;
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<section id="gmp.examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Factorial function using GMP</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function fact ($x) {
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if ($x <= 1)
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return 1;
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else
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return gmp_mul ($x, fact ($x-1));
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}
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print gmp_strval (fact (1000)) . "\n";
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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This will calculate factorial of 1000 (pretty big number)
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very fast.
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</para>
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</section>
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<section id="gmp.seealso">
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&reftitle.seealso;
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<para>
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More mathmatical functions can be found in the sections
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<link linkend="ref.bc">BCMath Arbitrary Precision Mathematics Functions</link>
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and <link linkend="ref.math">Mathematical Functions</link>.
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</para>
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</section>
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</partintro>
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&reference.gmp.functions;
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</reference>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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