mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 05:26:57 +08:00
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">
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
|
<title>十进制转换为十六进制</title>
|
|
</head>
|
|
<body class="docs"><div id="layout">
|
|
<div id="layout-content"><div id="function.dechex" class="refentry">
|
|
<div class="refnamediv">
|
|
<h1 class="refname">dechex</h1>
|
|
<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>
|
|
|
|
</div>
|
|
<div class="refsect1 description" id="refsect1-function.dechex-description">
|
|
<h3 class="title">说明</h3>
|
|
<div class="methodsynopsis dc-description">
|
|
<span class="methodname"><strong>dechex</strong></span>
|
|
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$number</code></span>
|
|
) : <span class="type">string</span></div>
|
|
|
|
<p class="para rdfs-comment">
|
|
返回一字符串，包含有给定
|
|
<code class="parameter">number</code>
|
|
参数的十六进制表示。
|
|
</p>
|
|
<p class="para">
|
|
所能转换的最大数值为十进制的
|
|
<strong><code>PHP_INT_MAX</code></strong><em> * 2 + 1</em> (或
|
|
<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>。
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 parameters" id="refsect1-function.dechex-parameters">
|
|
<h3 class="title">参数</h3>
|
|
<p class="para">
|
|
<dl>
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">number</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
要转换的十进制值
|
|
</p>
|
|
<p class="para">
|
|
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。
|
|
</p>
|
|
</dd>
|
|
|
|
|
|
</dl>
|
|
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 returnvalues" id="refsect1-function.dechex-returnvalues">
|
|
<h3 class="title">返回值</h3>
|
|
<p class="para">
|
|
<code class="parameter">number</code> 的16进制表示
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 examples" id="refsect1-function.dechex-examples">
|
|
<h3 class="title">范例</h3>
|
|
<p class="para">
|
|
<div class="example" id="example-4122">
|
|
<p><strong>Example #1 <span class="function"><strong>dechex()</strong></span> 例子</strong></p>
|
|
<div class="example-contents">
|
|
<div class="phpcode"><pre><span style="color: #000000">
|
|
<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>
|
|
</span>
|
|
</pre></div>
|
|
</div>
|
|
|
|
<div class="example-contents"><p>以上例程会输出：</p></div>
|
|
<div class="example-contents screen">
|
|
<div class="cdata"><pre>
|
|
a
|
|
2f
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</p>
|
|
<p class="para">
|
|
<div class="example" id="example-4123">
|
|
<p><strong>Example #2 大整数的 <span class="function"><strong>dechex()</strong></span> 例子</strong></p>
|
|
<div class="example-contents">
|
|
<div class="phpcode"><pre><span style="color: #000000">
|
|
<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>
|
|
</span>
|
|
</pre></div>
|
|
</div>
|
|
|
|
<div class="example-contents"><p>以上例程会输出：</p></div>
|
|
<div class="example-contents screen">
|
|
<div class="cdata"><pre>
|
|
ffffffff
|
|
ffffffff
|
|
ffffffff
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 seealso" id="refsect1-function.dechex-seealso">
|
|
<h3 class="title">参见</h3>
|
|
<p class="para">
|
|
<ul class="simplelist">
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
</ul>
|
|
</p>
|
|
</div>
|
|
|
|
</div></div></div></body></html> |