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94 lines
3.4 KiB
HTML
94 lines
3.4 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>计算 e 的指数</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.exp" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">exp</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">exp</span> — <span class="dc-title">计算 <strong><code>e</code></strong> 的指数</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.exp-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>exp</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 <strong><code>e</code></strong> 的 <code class="parameter">arg</code> 次方值。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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用 '<strong><code>e</code></strong>' 作为自然对数的底
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2.718282.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.exp-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.exp-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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'e' raised to the power of <code class="parameter">arg</code>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.exp-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-4126">
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<p><strong>Example #1 <span class="function"><strong>exp()</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: #007700">echo </span><span style="color: #0000BB">exp</span><span style="color: #007700">(</span><span style="color: #0000BB">12</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">exp</span><span style="color: #007700">(</span><span style="color: #0000BB">5.7</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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1.6275E+005
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298.87
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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.exp-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="log.html" class="function" rel="rdfs-seeAlso">log()</a> - 自然对数</span></li>
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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> |