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

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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>Get a cryptographically secure, uniformly selected integer</refpurpose>
 </refnamediv>

 <refsect1 role="description"><!-- {{{ -->
  &reftitle.description;
  <methodsynopsis>
   <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 a uniformly selected integer between the given minimum and maximum.
  </para>
  <para>
   The randomness generated by this function is suitable for all applications, including
   the generation of long-term secrets, such as encryption keys.
  </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.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>max</parameter></term>
    <listitem>
     <para>
      The highest value to be returned.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1><!-- }}} -->

 <refsect1 role="returnvalues"><!-- {{{ -->
  &reftitle.returnvalues;
  <para>
   A cryptographically secure, uniformly selected integer from the closed interval
   [<parameter>min</parameter>, <parameter>max</parameter>]. Both
   <parameter>min</parameter> and <parameter>max</parameter> are
   possible return values.
  </para>
 </refsect1><!-- }}} -->

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

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.2.0</entry>
      <entry>
       In case of a <acronym>CSPRNG</acronym> failure, this function will now throw a
       <classname>Random\RandomException</classname>. Previously a plain
       <classname>Exception</classname> was thrown.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </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><methodname>Random\Randomizer::getInt</methodname></member>
   <member><function>random_bytes</function></member>
  </simplelist>
 </refsect1><!-- }}} -->

</refentry>

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