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<?xml version="1.0" encoding="utf-8"?>

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<!-- $Revision$ -->

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.mt-srand">

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<refnamediv>

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<refname>mt_srand</refname>

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<refpurpose>Seed the better random number generator</refpurpose>

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</refnamediv>

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<refsect1 role="description">

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&reftitle.description;

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<methodsynopsis>

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<type>void</type><methodname>mt_srand</methodname>

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<methodparam choice="opt"><type>int</type><parameter>seed</parameter></methodparam>

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</methodsynopsis>

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<para>

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Seeds the random number generator with

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<parameter>seed</parameter> or with a random value

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if no <parameter>seed</parameter> is given.

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</para>

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&note.randomseed;

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</refsect1>

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<refsect1 role="parameters">

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&reftitle.parameters;

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<para>

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<variablelist>

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<varlistentry>

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<term><parameter>seed</parameter></term>

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<listitem>

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<para>

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An optional seed value

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</para>

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</listitem>

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</varlistentry>

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</variablelist>

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</para>

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</refsect1>

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<refsect1 role="returnvalues">

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&reftitle.returnvalues;

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<para>

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&return.void;

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</para>

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</refsect1>

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<refsect1 role="changelog">

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&reftitle.changelog;

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<para>

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<informaltable>

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<tgroup cols="2">

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<thead>

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<row>

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<entry>&Version;</entry>

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<entry>&Description;</entry>

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</row>

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</thead>

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<tbody>

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<row>

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<entry>4.2.0</entry>

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<entry>

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The <parameter>seed</parameter> becomes optional

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and defaults to a random value if omitted.

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</entry>

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</row>

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<row>

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<entry>5.2.1</entry>

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<entry>

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The Mersenne Twister implementation in PHP now uses a new seeding

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algorithm by Richard Wagner. Identical seeds no longer produce the same

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sequence of values they did in previous versions. This behavior is not

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expected to change again, but it is considered unsafe to rely upon it

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nonetheless.

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</entry>

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</row>

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</tbody>

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</tgroup>

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</informaltable>

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</para>

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</refsect1>

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<refsect1 role="examples">

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&reftitle.examples;

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<para>

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<example>

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<title><function>mt_srand</function> example</title>

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<programlisting role="php">

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<![CDATA[

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<?php

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// seed with microseconds

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function make_seed()

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{

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list($usec, $sec) = explode(' ', microtime());

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return (float) $sec + ((float) $usec * 100000);

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}

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mt_srand(make_seed());

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$randval = mt_rand();

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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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</refsect1>

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<refsect1 role="seealso">

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&reftitle.seealso;

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<para>

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<simplelist>

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<member><function>mt_rand</function></member>

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<member><function>mt_getrandmax</function></member>

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<member><function>srand</function></member>

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</simplelist>

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</para>

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</refsect1>

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</refentry>

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Local variables:

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sgml-parent-document:nil

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sgml-default-dtd-file:"~/.phpdoc/manual.ced"

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sgml-exposed-tags:nil

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sgml-local-catalogs:nil

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End:

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vim600: syn=xml fen fdm=syntax fdl=2 si

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-->

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