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136 lines
7.5 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>使用用户自定义的比较函数对数组中的值进行排序并保持索引关联</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.uasort" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">uasort</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">uasort</span> — <span class="dc-title">
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使用用户自定义的比较函数对数组中的值进行排序并保持索引关联
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.uasort-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>uasort</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$array</code></span>
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, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$value_compare_func</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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本函数对数组排序并保持索引和单元之间的关联。
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</p>
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<p class="para">
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主要用于对那些单元顺序很重要的结合数组进行排序。比较函数是用户自定义的。
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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.uasort-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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输入的数组。
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</p>
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</dd>
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<dt>
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<code class="parameter">value_compare_func</code></dt>
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<dd>
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<p class="para">
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用户自定义比较函数的例子请参考 <span class="function"><a href="usort.html" class="function">usort()</a></span> 和 <span class="function"><a href="uksort.html" class="function">uksort()</a></span>。
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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.uasort-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 examples" id="refsect1-function.uasort-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-6120">
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<p><strong>Example #1 <span class="function"><strong>uasort()</strong></span> 的基本例子</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">// Comparison function<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">cmp</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">) {<br /> if (</span><span style="color: #0000BB">$a </span><span style="color: #007700">== </span><span style="color: #0000BB">$b</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /> }<br /> return (</span><span style="color: #0000BB">$a </span><span style="color: #007700">< </span><span style="color: #0000BB">$b</span><span style="color: #007700">) ? -</span><span style="color: #0000BB">1 </span><span style="color: #007700">: </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Array to be sorted<br /></span><span style="color: #0000BB">$array </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'a' </span><span style="color: #007700">=> </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #DD0000">'b' </span><span style="color: #007700">=> </span><span style="color: #0000BB">8</span><span style="color: #007700">, </span><span style="color: #DD0000">'c' </span><span style="color: #007700">=> -</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">'d' </span><span style="color: #007700">=> -</span><span style="color: #0000BB">9</span><span style="color: #007700">, </span><span style="color: #DD0000">'e' </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">'f' </span><span style="color: #007700">=> </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'g' </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">'h' </span><span style="color: #007700">=> -</span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Sort and print the resulting array<br /></span><span style="color: #0000BB">uasort</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">, </span><span style="color: #DD0000">'cmp'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</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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Array
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(
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[a] => 4
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[b] => 8
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[c] => -1
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[d] => -9
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[e] => 2
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[f] => 5
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[g] => 3
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[h] => -4
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)
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Array
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(
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[d] => -9
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[h] => -4
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[c] => -1
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[e] => 2
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[g] => 3
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[a] => 4
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[f] => 5
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[b] => 8
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)
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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.uasort-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="usort.html" class="function" rel="rdfs-seeAlso">usort()</a> - 使用用户自定义的比较函数对数组中的值进行排序</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> |