function.bcpowmod.html
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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>Raise an arbitrary precision number to another, reduced by a specified modulus</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.bcpow.html">bcpow</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.bcscale.html">bcscale</a></div> <div class="up"><a href="ref.bc.html">BC Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.bcpowmod" class="refentry"> <div class="refnamediv"> <h1 class="refname">bcpowmod</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">bcpowmod</span> — <span class="dc-title">Raise an arbitrary precision number to another, reduced by a specified modulus</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>bcpowmod</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$left_operand</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$right_operand</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$modulus</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$scale</tt></span> ] )</div> <p class="para rdfs-comment"> Use the fast-exponentiation method to raise <i><tt class="parameter">left_operand</tt></i> to the power <i><tt class="parameter">right_operand</tt></i> with respect to the modulus <i><tt class="parameter">modulus</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">left_operand</tt></i></span> <dd> <p class="para"> The left operand, as a string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">right_operand</tt></i></span> <dd> <p class="para"> The right operand, as a string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">modulus</tt></i></span> <dd> <p class="para"> The modulus, as a string. </p> </dd> </dt> <dt><span class="term"><i><tt class="parameter">scale</tt></i></span><dd><p class="para">This optional parameter is used to set the numberof digits after the decimal place in the result. You can also set the global default scalefor all functions by using <a href="function.bcscale.html" class="function">bcscale()</a>.</p></dd></dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the result as a string, or <b><tt>NULL</tt></b> if <i><tt class="parameter">modulus</tt></i> is 0. </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Because this method uses the modulus operation, non-natural numbers may give unexpected results. A natural number is any positive non-zero integer. <br /> </p></blockquote> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> The following two statements are functionally identical. The <b>bcpowmod()</b> version however, executes in less time and can accept larger parameters. <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= </span><span style="color: #0000BB">bcpowmod</span><span style="color: #007700">(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">, </span><span style="color: #0000BB">$mod</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= </span><span style="color: #0000BB">bcmod</span><span style="color: #007700">(</span><span style="color: #0000BB">bcpow</span><span style="color: #007700">(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">), </span><span style="color: #0000BB">$mod</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// $a and $b are equal to each other.<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.bcpow.html" class="function" rel="rdfs-seeAlso">bcpow()</a></li> <li class="member"><a href="function.bcmod.html" class="function" rel="rdfs-seeAlso">bcmod()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.bcpow.html">bcpow</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.bcscale.html">bcscale</a></div> <div class="up"><a href="ref.bc.html">BC Math 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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