php-doc-en/reference/csprng/functions/random-int.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.random-int" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>random_int</refname>
  <refpurpose>Generates cryptographically secure pseudo-random integers</refpurpose>
 </refnamediv>

 <refsect1 role="description"><!-- {{{ -->
  &reftitle.description;
  <methodsynopsis role="procedural">
   <type>int</type><methodname>random_int</methodname>
   <methodparam><type>int</type><parameter>min</parameter></methodparam>
   <methodparam><type>int</type><parameter>max</parameter></methodparam>
  </methodsynopsis>
  <para>
   Generates cryptographic random integers that are suitable for use where
   unbiased results are critical, such as when shuffling a deck of cards for a
   poker game.
  </para>
  &csprng.sources;
  &csprng.function.backport;
 </refsect1><!-- }}} -->

 <refsect1 role="parameters"><!-- {{{ -->
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>min</parameter></term>
    <listitem>
     <para>
      The lowest value to be returned, which must be
      <constant>PHP_INT_MIN</constant> or higher.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>max</parameter></term>
    <listitem>
     <para>
      The highest value to be returned, which must be less than or equal to
      <constant>PHP_INT_MAX</constant>.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1><!-- }}} -->

 <refsect1 role="returnvalues"><!-- {{{ -->
  &reftitle.returnvalues;
  <para>
   Returns a cryptographically secure random integer in the range
   <parameter>min</parameter> to <parameter>max</parameter>, inclusive.
  </para>
 </refsect1><!-- }}} -->

 <refsect1 role="errors"><!-- {{{ -->
  &reftitle.errors;
  <itemizedlist>
   &csprng.errors;
   <listitem>
    <simpara>
     If <parameter>max</parameter> is less than <parameter>min</parameter>, an
     <classname>Error</classname> will be thrown.
    </simpara>
   </listitem>
  </itemizedlist>
 </refsect1><!-- }}} -->

 <refsect1 role="examples"><!-- {{{ -->
  &reftitle.examples;
  <example xml:id="random-int.example.basic"><!-- {{{ -->
   <title><function>random_int</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
var_dump(random_int(100, 999));
var_dump(random_int(-1000, 0));
?>
]]>
   </programlisting>
   &example.outputs.similar;
   <screen>
<![CDATA[
int(248)
int(-898)
]]>
   </screen>
  </example><!-- }}} -->
 </refsect1><!-- }}} -->

 <refsect1 role="seealso"><!-- {{{ -->
  &reftitle.seealso;
  <simplelist>
   <member><function>random_bytes</function></member>
  </simplelist>
 </refsect1><!-- }}} -->

</refentry>

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