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99 lines
4.7 KiB
HTML
99 lines
4.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Raise number into power</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.gmp-pow" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gmp_pow</h1>
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<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_pow</span> — <span class="dc-title">Raise number into power</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gmp-pow-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>gmp_pow</strong></span>
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( <span class="methodparam"><span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <code class="parameter">$base</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$exp</code></span>
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) : <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span></div>
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<p class="para rdfs-comment">
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Raise <code class="parameter">base</code> into power <code class="parameter">exp</code>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gmp-pow-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">base</code></dt>
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<dd>
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<p class="para">
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The base number.
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</p>
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<p class="para">可以是一个 GMP
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数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</p>
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</dd>
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<dt>
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<code class="parameter">exp</code></dt>
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<dd>
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<p class="para">
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The positive power to raise the <code class="parameter">base</code>.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.gmp-pow-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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The new (raised) number, as a GMP number. The case of
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<em>0^0</em> yields 1.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gmp-pow-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4090">
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<p><strong>Example #1 <span class="function"><strong>gmp_pow()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$pow1 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_pow</span><span style="color: #007700">(</span><span style="color: #DD0000">"2"</span><span style="color: #007700">, </span><span style="color: #0000BB">31</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$pow1</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$pow2 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_pow</span><span style="color: #007700">(</span><span style="color: #DD0000">"0"</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$pow2</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$pow3 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_pow</span><span style="color: #007700">(</span><span style="color: #DD0000">"2"</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">); </span><span style="color: #FF8000">// Negative exp, generates warning<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$pow3</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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2147483648
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1
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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</div></div></div></body></html> |