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255 lines
8.0 KiB
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<!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>十进制转换为二进制</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.decbin" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">decbin</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">decbin</span> — <span class="dc-title">十进制转换为二进制</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.decbin-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>decbin</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> 参数的二进制表示。所能转换的最大数值为十进制的
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4294967295，其结果为 32 个 1 的字符串。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.decbin-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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Decimal value to convert
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</p>
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<table class="doctable table">
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<caption><strong>Range of inputs on 32-bit machines</strong></caption>
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<col />
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<col />
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<col />
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<thead>
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<tr>
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<th>positive <code class="parameter">number</code></th>
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<th>negative <code class="parameter">number</code></th>
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<th>return value</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>0</td>
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<td class="empty"> </td>
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<td>0</td>
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</tr>
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<tr>
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<td>1</td>
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<td class="empty"> </td>
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<td>1</td>
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</tr>
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<tr>
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<td>2</td>
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<td class="empty"> </td>
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<td>10</td>
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</tr>
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<tr>
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<td colspan="3">... normal progression ...</td>
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</tr>
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<tr>
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<td>2147483646</td>
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<td class="empty"> </td>
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<td>1111111111111111111111111111110</td>
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</tr>
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<tr>
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<td>2147483647 (largest signed integer)</td>
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<td class="empty"> </td>
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<td>1111111111111111111111111111111 (31 1's)</td>
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</tr>
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<tr>
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<td>2147483648</td>
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<td>-2147483648</td>
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<td>10000000000000000000000000000000</td>
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</tr>
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<tr>
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<td colspan="3">... normal progression ...</td>
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</tr>
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<tr>
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<td>4294967294</td>
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<td>-2</td>
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<td>11111111111111111111111111111110</td>
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</tr>
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<tr>
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<td>4294967295 (largest unsigned integer)</td>
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<td>-1</td>
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<td>11111111111111111111111111111111 (32 1's)</td>
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</tr>
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</tbody>
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</table>
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<table class="doctable table">
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<caption><strong>Range of inputs on 64-bit machines</strong></caption>
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<col />
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<col />
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<col />
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<thead>
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<tr>
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<th>positive <code class="parameter">number</code></th>
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<th>negative <code class="parameter">number</code></th>
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<th>return value</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>0</td>
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<td class="empty"> </td>
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<td>0</td>
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</tr>
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<tr>
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<td>1</td>
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<td class="empty"> </td>
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<td>1</td>
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</tr>
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<tr>
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<td>2</td>
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<td class="empty"> </td>
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<td>10</td>
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</tr>
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<tr>
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<td colspan="3">... normal progression ...</td>
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</tr>
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<tr>
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<td>9223372036854775806</td>
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<td class="empty"> </td>
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<td>111111111111111111111111111111111111111111111111111111111111110</td>
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</tr>
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<tr>
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<td>9223372036854775807 (largest signed integer)</td>
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<td class="empty"> </td>
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<td>111111111111111111111111111111111111111111111111111111111111111 (63 1's)</td>
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</tr>
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<tr>
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<td class="empty"> </td>
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<td>-9223372036854775808</td>
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<td>1000000000000000000000000000000000000000000000000000000000000000</td>
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</tr>
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<tr>
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<td colspan="3">... normal progression ...</td>
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</tr>
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<tr>
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<td class="empty"> </td>
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<td>-2</td>
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<td>1111111111111111111111111111111111111111111111111111111111111110</td>
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</tr>
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<tr>
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<td class="empty"> </td>
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<td>-1</td>
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<td>1111111111111111111111111111111111111111111111111111111111111111 (64 1's)</td>
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</tr>
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</tbody>
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</table>
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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.decbin-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Binary string representation of <code class="parameter">number</code>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.decbin-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-4121">
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<p><strong>Example #1 <span class="function"><strong>decbin()</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">decbin</span><span style="color: #007700">(</span><span style="color: #0000BB">12</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">decbin</span><span style="color: #007700">(</span><span style="color: #0000BB">26</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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1100
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11010
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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.decbin-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="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="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="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="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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<li class="member">
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<span class="function"><a href="printf.html" class="function" rel="rdfs-seeAlso">printf()</a> - 输出格式化字符串</span>, using <em>%b</em>,
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<em>%032b</em> or <em>%064b</em> as the format
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</li>
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<li class="member">
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<span class="function"><a href="sprintf.html" class="function">sprintf()</a></span>, using <em>%b</em>,
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<em>%032b</em> or <em>%064b</em> as the format
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</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> |