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123 lines
4.8 KiB
HTML
123 lines
4.8 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>打乱数组</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.shuffle" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">shuffle</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">shuffle</span> — <span class="dc-title">打乱数组</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.shuffle-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>shuffle</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$array</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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本函数打乱（随机排列单元的顺序）一个数组。
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它使用的是伪随机数产生器，并不适合密码学的场合。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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If two members compare as equal, their relative order in the sorted array is undefined.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.shuffle-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">array</code></dt>
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<dd>
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<p class="para">
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待操作的数组。
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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.shuffle-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.shuffle-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>7.1.0</td>
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<td>
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<a href="migration71.incompatible.html#migration71.incompatible.rand_srand_aliases" class="link">内置的随机数产生算法从 libc rand 函数改成 <a href="http://www.math.sci.hiroshima_u.ac.jp/~m_mat/MT/emt.html" class="link external">» 梅森旋转</a>伪随机数生成算法。</a>
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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.shuffle-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-6117">
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<p><strong>Example #1 <span class="function"><strong>shuffle()</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 />$numbers </span><span style="color: #007700">= </span><span style="color: #0000BB">range</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">shuffle</span><span style="color: #007700">(</span><span style="color: #0000BB">$numbers</span><span style="color: #007700">);<br />foreach (</span><span style="color: #0000BB">$numbers </span><span style="color: #007700">as </span><span style="color: #0000BB">$number</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$number</span><span style="color: #DD0000"> "</span><span style="color: #007700">;<br />}<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 notes" id="refsect1-function.shuffle-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数为 <code class="parameter">array</code>
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中的元素赋与新的键名。这将删除原有的键名，而不是仅仅将键名重新排序。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.shuffle-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="array_rand.html" class="function" rel="rdfs-seeAlso">array_rand()</a> - 从数组中随机取出一个或多个单元</span></li>
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<li class="member"><a href="array.sorting.html" class="link">数组排序函数对比</a></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> |