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116 lines
5.3 KiB
HTML
116 lines
5.3 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>十六进制转换为十进制</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.hexdec" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">hexdec</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">hexdec</span> — <span class="dc-title">十六进制转换为十进制</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.hexdec-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>hexdec</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$hex_string</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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返回与 <code class="parameter">hex_string</code>
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参数所表示的十六进制数等值的的十进制数。<span class="function"><strong>hexdec()</strong></span>
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将一个十六进制字符串转换为十进制数。
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</p>
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<p class="para">
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<span class="function"><strong>hexdec()</strong></span> 会忽略它遇到的任意非十六进制的字符。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.hexdec-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">hex_string</code></dt>
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<dd>
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<p class="para">
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要转换的十六进制的字符串
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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.hexdec-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para"> <code class="parameter">hex_string</code> 十进制的表示
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.hexdec-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>4.1.0</td>
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<td>
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PHP 4.1.0
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开始，该函数可以处理 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 大数字，这种情况下，它会返回 <span class="type"><a href="language.types.float.html" class="type float">float</a></span> 类型。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.hexdec-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-4129">
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<p><strong>Example #1 <span class="function"><strong>hexdec()</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 />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"See"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"ee"</span><span style="color: #007700">));<br /></span><span style="color: #FF8000">// both print "int(238)"<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"that"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// print "int(10)"<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">hexdec</span><span style="color: #007700">(</span><span style="color: #DD0000">"a0"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// print "int(160)"<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.hexdec-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="dechex.html" class="function" rel="rdfs-seeAlso">dechex()</a> - 十进制转换为十六进制</span></li>
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<li class="member"><span class="function"><a href="bindec.html" class="function" rel="rdfs-seeAlso">bindec()</a> - 二进制转换为十进制</span></li>
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<li class="member"><span class="function"><a href="octdec.html" class="function" rel="rdfs-seeAlso">octdec()</a> - 八进制转换为十进制</span></li>
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<li class="member"><span class="function"><a href="base_convert.html" class="function" rel="rdfs-seeAlso">base_convert()</a> - 在任意进制之间转换数字</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> |