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86 lines
4.3 KiB
HTML
86 lines
4.3 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>绝对值</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.abs" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">abs</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">abs</span> — <span class="dc-title">绝对值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.abs-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>abs</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$number</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.number" class="type number">number</a></span></div>
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<p class="para rdfs-comment">
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返回参数 <code class="parameter">number</code> 的绝对值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.abs-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">number</code></dt>
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<dd>
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<p class="para">
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要处理的数字值
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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.abs-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<code class="parameter">number</code> 的绝对值。 如果参数 <code class="parameter">number</code>
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是 <span class="type"><a href="language.types.float.html" class="type float">float</a></span>，则返回的类型也是 <span class="type"><a href="language.types.float.html" class="type float">float</a></span>，否则返回
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<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>（因为 <span class="type"><a href="language.types.float.html" class="type float">float</a></span> 通常比 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 有更大的取值范围）。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.abs-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-4115">
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<p><strong>Example #1 <span class="function"><strong>abs()</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 />$abs </span><span style="color: #007700">= </span><span style="color: #0000BB">abs</span><span style="color: #007700">(-</span><span style="color: #0000BB">4.2</span><span style="color: #007700">); </span><span style="color: #FF8000">// $abs = 4.2; (double/float)<br /></span><span style="color: #0000BB">$abs2 </span><span style="color: #007700">= </span><span style="color: #0000BB">abs</span><span style="color: #007700">(</span><span style="color: #0000BB">5</span><span style="color: #007700">); </span><span style="color: #FF8000">// $abs2 = 5; (integer)<br /></span><span style="color: #0000BB">$abs3 </span><span style="color: #007700">= </span><span style="color: #0000BB">abs</span><span style="color: #007700">(-</span><span style="color: #0000BB">5</span><span style="color: #007700">); </span><span style="color: #FF8000">// $abs3 = 5; (integer)<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.abs-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="gmp_abs.html" class="function" rel="rdfs-seeAlso">gmp_abs()</a> - Absolute value</span></li>
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<li class="member"><span class="function"><a href="gmp_sign.html" class="function" rel="rdfs-seeAlso">gmp_sign()</a> - Sign of number</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> |