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80 lines
3.0 KiB
HTML
80 lines
3.0 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>平方根</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.sqrt" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">sqrt</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">sqrt</span> — <span class="dc-title">平方根</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.sqrt-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>sqrt</strong></span>
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( <span class="methodparam"><span class="type">float</span> <code class="parameter">$arg</code></span>
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) : <span class="type">float</span></div>
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<p class="para rdfs-comment">
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返回 <code class="parameter">arg</code> 的平方根。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.sqrt-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">arg</code></dt>
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<dd>
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<p class="para">
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要处理的参数
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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.sqrt-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回 <code class="parameter">arg</code> 的平方根，负数时返回 <em>NAN</em>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.sqrt-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-4145">
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<p><strong>Example #1 <span class="function"><strong>sqrt()</strong></span> 例子</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 /></span><span style="color: #FF8000">// Precision depends on your precision directive<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">sqrt</span><span style="color: #007700">(</span><span style="color: #0000BB">9</span><span style="color: #007700">); </span><span style="color: #FF8000">// 3<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">sqrt</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">); </span><span style="color: #FF8000">// 3.16227766 ...<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>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.sqrt-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="pow.html" class="function" rel="rdfs-seeAlso">pow()</a> - 指数表达式</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |