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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Find next prime number</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div 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"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>gmp_nextprime</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$a</tt></span> )</div> <p class="para rdfs-comment"> Find next prime number </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">a</tt></i></span> <dd> <p class="para">It can be either a GMP number <a href="language.types.resource.html" class="type resource">resource</a>, or a numeric string given that it is possible to convert the latter to a number.</p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Return the next prime number greater than <i><tt class="parameter">a</tt></i>, as a GMP number. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>gmp_nextprime()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$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"><pre><div class="cdata"><pre>11-997</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: This function uses a probabilistic algorithm to identify primes and chances to get a composite number are extremely small. <br /> </p></blockquote> </div></div><hr /><div 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>⌨️ 快捷键说明
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