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44 lines
2.8 KiB
HTML
44 lines
2.8 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>获取变量的浮点值</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.floatval" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">floatval</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">floatval</span> — <span class="dc-title">获取变量的浮点值</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.floatval-unknown-seealsp">
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<h3 class="title">描述</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>floatval</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">$var</code></span>
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) : <span class="type">float</span></div>
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<p class="simpara">
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返回变量 <code class="parameter">var</code>
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的 <span class="type"><a href="language.types.float.html" class="type float">float</a></span> 数值。
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</p>
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<p class="para">
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<code class="parameter">var</code> 可以是任何标量类型。你不能将
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<span class="function"><strong>floatval()</strong></span> 用于数组或对象。
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<div class="informalexample">
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$var </span><span style="color: #007700">= </span><span style="color: #DD0000">'122.34343The'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$float_value_of_var </span><span style="color: #007700">= </span><span style="color: #0000BB">floatval </span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">);<br />print </span><span style="color: #0000BB">$float_value_of_var</span><span style="color: #007700">; </span><span style="color: #FF8000">// 打印出 122.34343<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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<p class="simpara">
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参见 <span class="function"><a href="intval.html" class="function">intval()</a></span>、<span class="function"><a href="strval.html" class="function">strval()</a></span>、<span class="function"><a href="settype.html" class="function">settype()</a></span> 和
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<a href="language.types.type_juggling.html" class="link">类型戏法</a>。
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</p>
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</div>
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</div></div></div></body></html> |