<!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>Find next prime number</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.gmp-neg.html">gmp_neg</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.gmp-or.html">gmp_or</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-nextprime" class="refentry">
<div class="refnamediv">
<h1 class="refname">gmp_nextprime</h1>
<p class="verinfo">(PHP 5 >= 5.2.0)</p><p class="refpurpose"><span class="refname">gmp_nextprime</span> — <span class="dc-title">Find next prime number</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.gmp-nextprime-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">resource</span> <span class="methodname"><strong>gmp_nextprime</strong></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$a</code></span>
)</div>
<p class="para rdfs-comment">
Find next prime number
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.gmp-nextprime-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">a</code></em></span>
<dd>
<p class="para">It can be either a GMP number <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>, or a
numeric string given that it is possible to convert the latter to a number.</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.gmp-nextprime-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Return the next prime number greater than <em><code class="parameter">a</code></em>,
as a GMP number.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.gmp-nextprime-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3421">
<p><strong>Example #1 <span class="function"><strong>gmp_nextprime()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$prime1 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_nextprime</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">); </span><span style="color: #FF8000">// next prime number greater than 10<br /></span><span style="color: #0000BB">$prime2 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_nextprime</span><span style="color: #007700">(-</span><span style="color: #0000BB">1000</span><span style="color: #007700">); </span><span style="color: #FF8000">// next prime number greater than -1000<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$prime1</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">$prime2</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>
11
-997
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.gmp-nextprime-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
This function uses a probabilistic algorithm to identify primes and
chances to get a composite number are extremely small.
</p>
</p></blockquote>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.gmp-neg.html">gmp_neg</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.gmp-or.html">gmp_or</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>
