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<!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>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>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.uasort" class="refentry">
<div class="refnamediv">
<h1 class="refname">uasort</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">uasort</span> &mdash; <span class="dc-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
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.uasort-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>uasort</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$array</code></span>
, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$value_compare_func</code></span>
) : <span class="type">bool</span></div>
<p class="para rdfs-comment">
本函数对数组排序并保持索引和单元之间的关联。
</p>
<p class="para">
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。
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
If two members compare as equal, their relative order in the sorted array is undefined.
</p>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.uasort-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">array</code></dt>
<dd>
<p class="para">
输入的数组。
</p>
</dd>
<dt>
<code class="parameter">value_compare_func</code></dt>
<dd>
<p class="para">
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><span class="function"><a href="uksort.html" class="function">uksort()</a></span>
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.uasort-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
成功时返回 <strong><code>TRUE</code></strong> 或者在失败时返回 <strong><code>FALSE</code></strong>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.uasort-examples">
<h3 class="title">范例</h3>
<p class="para">
<div class="example" id="example-6120">
<p><strong>Example #1 <span class="function"><strong>uasort()</strong></span> 的基本例子</strong></p>
<div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;Comparison&nbsp;function<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">cmp</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">&lt;&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">)&nbsp;?&nbsp;-</span><span style="color: #0000BB">1&nbsp;</span><span style="color: #007700">:&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;Array&nbsp;to&nbsp;be&nbsp;sorted<br /></span><span style="color: #0000BB">$array&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #DD0000">'a'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">4</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'b'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">8</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'c'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'d'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;-</span><span style="color: #0000BB">9</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'e'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'f'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'g'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'h'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;-</span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Sort&nbsp;and&nbsp;print&nbsp;the&nbsp;resulting&nbsp;array<br /></span><span style="color: #0000BB">uasort</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'cmp'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</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>
Array
(
[a] =&gt; 4
[b] =&gt; 8
[c] =&gt; -1
[d] =&gt; -9
[e] =&gt; 2
[f] =&gt; 5
[g] =&gt; 3
[h] =&gt; -4
)
Array
(
[d] =&gt; -9
[h] =&gt; -4
[c] =&gt; -1
[e] =&gt; 2
[g] =&gt; 3
[a] =&gt; 4
[f] =&gt; 5
[b] =&gt; 8
)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.uasort-seealso">
<h3 class="title">参见</h3>
<p class="para">
<ul class="simplelist">
<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>
<li class="member"><a href="array.sorting.html" class="link">数组排序函数对比</a></li>
</ul>
</p>
</div>
<!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>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>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.uasort" class="refentry">
<div class="refnamediv">
<h1 class="refname">uasort</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">uasort</span> &mdash; <span class="dc-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
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.uasort-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>uasort</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$array</code></span>
, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$value_compare_func</code></span>
) : <span class="type">bool</span></div>
<p class="para rdfs-comment">
本函数对数组排序并保持索引和单元之间的关联。
</p>
<p class="para">
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。
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
If two members compare as equal, their relative order in the sorted array is undefined.
</p>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.uasort-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">array</code></dt>
<dd>
<p class="para">
输入的数组。
</p>
</dd>
<dt>
<code class="parameter">value_compare_func</code></dt>
<dd>
<p class="para">
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><span class="function"><a href="uksort.html" class="function">uksort()</a></span>
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.uasort-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
成功时返回 <strong><code>TRUE</code></strong> 或者在失败时返回 <strong><code>FALSE</code></strong>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.uasort-examples">
<h3 class="title">范例</h3>
<p class="para">
<div class="example" id="example-6120">
<p><strong>Example #1 <span class="function"><strong>uasort()</strong></span> 的基本例子</strong></p>
<div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;Comparison&nbsp;function<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">cmp</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">&lt;&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">)&nbsp;?&nbsp;-</span><span style="color: #0000BB">1&nbsp;</span><span style="color: #007700">:&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;Array&nbsp;to&nbsp;be&nbsp;sorted<br /></span><span style="color: #0000BB">$array&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #DD0000">'a'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">4</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'b'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">8</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'c'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'d'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;-</span><span style="color: #0000BB">9</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'e'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'f'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'g'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'h'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;-</span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Sort&nbsp;and&nbsp;print&nbsp;the&nbsp;resulting&nbsp;array<br /></span><span style="color: #0000BB">uasort</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'cmp'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</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>
Array
(
[a] =&gt; 4
[b] =&gt; 8
[c] =&gt; -1
[d] =&gt; -9
[e] =&gt; 2
[f] =&gt; 5
[g] =&gt; 3
[h] =&gt; -4
)
Array
(
[d] =&gt; -9
[h] =&gt; -4
[c] =&gt; -1
[e] =&gt; 2
[g] =&gt; 3
[a] =&gt; 4
[f] =&gt; 5
[b] =&gt; 8
)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.uasort-seealso">
<h3 class="title">参见</h3>
<p class="para">
<ul class="simplelist">
<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>
<li class="member"><a href="array.sorting.html" class="link">数组排序函数对比</a></li>
</ul>
</p>
</div>
</div></div></div></body></html>