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120 lines
6.2 KiB
HTML
120 lines
6.2 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>十进制转换为十六进制</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.dechex" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dechex</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dechex</span> — <span class="dc-title">十进制转换为十六进制</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dechex-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>dechex</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$number</code></span>
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) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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返回一字符串，包含有给定
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<code class="parameter">number</code>
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参数的十六进制表示。
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</p>
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<p class="para">
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所能转换的最大数值为十进制的
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<strong><code>PHP_INT_MAX</code></strong><em> * 2 + 1</em> (或
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<em>-1</em>)：在 32 位平台上是十进制的 <em>4294967295</em>，其 <span class="function"><strong>dechex()</strong></span> 的结果为 <em>ffffffff</em>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dechex-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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要转换的十进制值
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</p>
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<p class="para">
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PHP 的 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 类型是有符号的，但 <span class="function"><strong>dechex()</strong></span> 处理无符号整数，负正数会以无符号处理。
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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.dechex-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16进制表示
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.dechex-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-4122">
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<p><strong>Example #1 <span class="function"><strong>dechex()</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">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">47</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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a
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2f
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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="para">
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<div class="example" id="example-4123">
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<p><strong>Example #2 大整数的 <span class="function"><strong>dechex()</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">// The output below assumes a 32-bit platform.<br />// Note that the output is the same for all values.<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(-</span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">PHP_INT_MAX </span><span style="color: #007700">* </span><span style="color: #0000BB">2 </span><span style="color: #007700">+ </span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">pow</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">32</span><span style="color: #007700">) - </span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</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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ffffffff
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ffffffff
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ffffffff
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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.dechex-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="hexdec.html" class="function" rel="rdfs-seeAlso">hexdec()</a> - 十六进制转换为十进制</span></li>
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<li class="member"><span class="function"><a href="decbin.html" class="function" rel="rdfs-seeAlso">decbin()</a> - 十进制转换为二进制</span></li>
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<li class="member"><span class="function"><a href="decoct.html" class="function" rel="rdfs-seeAlso">decoct()</a> - 十进制转换为八进制</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> |