php-doc-en/reference/gmp/functions/gmp-random.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.gmp-random">
 <refnamediv>
  <refname>gmp_random</refname>
  <refpurpose>Random number</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>gmp_random</methodname>
   <methodparam choice="opt"><type>int</type><parameter>limiter</parameter><initializer>20</initializer></methodparam>
  </methodsynopsis>
  <para>
   Generate a random number. The number will be between
   zero and the number of bits per limb multiplied by
   <parameter>limiter</parameter>. If <parameter>limiter</parameter>
   is negative, negative numbers are generated.
  </para>
  <para>
   A limb is an internal GMP mechanism. The number of bits in a limb is
   not static, and can vary from system to system. Generally, the number
   of bits in a limb is either 16 or 32, but this is not guaranteed.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>limiter</parameter></term>
     <listitem>
      <para>
       The limiter.
      </para>
      &gmp.parameter; 
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A random GMP number.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>gmp_random</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$rand1 = gmp_random(1); // random number from 0 to 1 * bits per limb
$rand2 = gmp_random(2); // random number from 0 to 2 * bits per limb

echo gmp_strval($rand1) . "\n";
echo gmp_strval($rand2) . "\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1915834968
8642564075890328087
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>

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