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125 lines
4.6 KiB
HTML
125 lines
4.6 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>在任意进制之间转换数字</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.base-convert" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">base_convert</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">base_convert</span> — <span class="dc-title">在任意进制之间转换数字</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.base-convert-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>base_convert</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$number</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$frombase</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$tobase</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 <code class="parameter">number</code>
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以 <code class="parameter">tobase</code> 进制的表示。<code class="parameter">number</code>
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本身的进制由
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<code class="parameter">frombase</code> 指定。<code class="parameter">frombase</code>
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和 <code class="parameter">tobase</code> 都只能在
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2 和 36 之间（包括 2 和 36）。高于十进制的数字用字母 a-z 表示，例如
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a 表示 10，b 表示 11 以及 z 表示 35。
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</p>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="simpara">
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由于使用内部的 "double" 或 "float" 类型，<span class="function"><strong>base_convert()</strong></span>
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的操作可能会导致大数值中的精度丢失。请参见本手册的
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<a href="language.types.float.html" class="link">浮点数</a> 章节以便获得更多详细信息。
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</p>
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</div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.base-convert-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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要转换的数字
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</p>
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</dd>
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<dt>
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<code class="parameter">frombase</code></dt>
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<dd>
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<p class="para">
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The base <code class="parameter">number</code> is in
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</p>
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</dd>
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<dt>
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<code class="parameter">tobase</code></dt>
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<dd>
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<p class="para">
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The base to convert <code class="parameter">number</code> to
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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.base-convert-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> converted to base <code class="parameter">tobase</code>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.base-convert-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-4116">
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<p><strong>Example #1 <span class="function"><strong>base_convert()</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 />$hexadecimal </span><span style="color: #007700">= </span><span style="color: #DD0000">'A37334'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">base_convert</span><span style="color: #007700">(</span><span style="color: #0000BB">$hexadecimal</span><span style="color: #007700">, </span><span style="color: #0000BB">16</span><span style="color: #007700">, </span><span style="color: #0000BB">2</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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101000110111001100110100
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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.base-convert-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="intval.html" class="function" rel="rdfs-seeAlso">intval()</a> - 获取变量的整数值</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> |