<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Random number</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.gmp-prob-prime.html">gmp_prob_prime</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.gmp-random-range.html">gmp_random_range</a></div> <div class="up"><a href="ref.gmp.html">GMP Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.gmp-random-bits" class="refentry"> <div class="refnamediv"> <h1 class="refname">gmp_random_bits</h1> <p class="verinfo">(PHP 5 >= 5.6.3, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_random_bits</span> — <span class="dc-title">Random number</span></p> </div> <div class="refsect1 description" id="refsect1-function.gmp-random-bits-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <span class="methodname"><strong>gmp_random_bits</strong></span> ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$bits</code></span> )</div> <p class="para rdfs-comment"> Generate a random number. The number will be between 0 and (2 ** <code class="parameter">bits</code>) - 1. </p> <p class="para"> <code class="parameter">bits</code> must greater than 0, and the maximum value is restricted by available memory. </p> </div> <div class="refsect1 parameters" id="refsect1-function.gmp-random-bits-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <code class="parameter">bits</code></dt> <dd> <p class="para"> The number of bits. </p> <p class="para">Either a GMP number <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span> in PHP 5.5 and earlier, a <a href="class.gmp.html" class="classname">GMP</a> object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.</p> </dd> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.gmp-random-bits-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A random GMP number. </p> </div> <div class="refsect1 examples" id="refsect1-function.gmp-random-bits-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-4221"> <p><strong>Example #1 <span class="function"><strong>gmp_random_bits()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$rand1 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_random_bits</span><span style="color: #007700">(</span><span style="color: #0000BB">3</span><span style="color: #007700">); </span><span style="color: #FF8000">// random number from 0 to 7<br /></span><span style="color: #0000BB">$rand2 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_random_bits</span><span style="color: #007700">(</span><span style="color: #0000BB">5</span><span style="color: #007700">); </span><span style="color: #FF8000">// random number from 0 to 31<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand1</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand2</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> 3 15 </pre></div> </div> </div> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.gmp-prob-prime.html">gmp_prob_prime</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.gmp-random-range.html">gmp_random_range</a></div> <div class="up"><a href="ref.gmp.html">GMP Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>