doc-en/reference/gmp/functions/gmp-random-range.xml at master · php/doc-en · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="function.gmp-random-range" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>gmp_random_range</refname>
  <refpurpose>Get a uniformly selected integer</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>GMP</type><methodname>gmp_random_range</methodname>
   <methodparam><type class="union"><type>GMP</type><type>int</type><type>string</type></type><parameter>min</parameter></methodparam>
   <methodparam><type class="union"><type>GMP</type><type>int</type><type>string</type></type><parameter>max</parameter></methodparam>
  </methodsynopsis>
  <para>
   Generate a random number. The number will be between
   <parameter>min</parameter> and <parameter>max</parameter>.
  </para>
  <para>
   <parameter>min</parameter> and <parameter>max</parameter> can both be negative,
   but <parameter>min</parameter> must always be less than <parameter>max</parameter>.
  </para>
  &caution.cryptographically-insecure;
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>min</parameter></term>
     <listitem>
      <para>
       A GMP number representing the lower bound for the random number
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>max</parameter></term>
     <listitem>
      <para>
       A GMP number representing the upper bound for the random number
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a <classname>GMP</classname> object which contains
   a 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;
  <para>
   If <parameter>max</parameter> is less than <parameter>min</parameter>,
   a <exceptionname>ValueError</exceptionname> will be thrown.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>gmp_random_range</function> example</title>
    <programlisting role="php">
     <![CDATA[
<?php
$rand1 = gmp_random_range(0, 100);    // random number between 0 and 100
$rand2 = gmp_random_range(-100, -10); // random number between -100 and -10

echo gmp_strval($rand1) . "\n";
echo gmp_strval($rand2) . "\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
42
-67
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>
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