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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Sort an array with a user-defined comparison function and maintain index association</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.sort.html">sort</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.uksort.html">uksort</a></div> <div class="up"><a href="ref.array.html">Array Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.uasort" class="refentry"> <div class="refnamediv"> <h1 class="refname">uasort</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">uasort</span> — <span class="dc-title">Sort an array with a user-defined comparison function and maintain index association</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>uasort</b></b></span> ( <span class="methodparam"><span class="type">array</span> <tt class="parameter reference">&$array</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$cmp_function</tt></span> )</div> <p class="para rdfs-comment"> This function sorts an array such that array indices maintain their correlation with the array elements they are associated with, using a user-defined comparison function. </p> <p class="para"> This is used mainly when sorting associative arrays where the actual element order is significant. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">array</tt></i></span> <dd> <p class="para"> The input array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">cmp_function</tt></i></span> <dd> <p class="para"> See <a href="function.usort.html" class="function">usort()</a> and <a href="function.uksort.html" class="function">uksort()</a> for examples of user-defined comparison functions. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.usort.html" class="function" rel="rdfs-seeAlso">usort()</a></li> <li class="member"><a href="function.uksort.html" class="function" rel="rdfs-seeAlso">uksort()</a></li> <li class="member"><a href="function.asort.html" class="function" rel="rdfs-seeAlso">asort()</a></li> <li class="member"><a href="function.arsort.html" class="function" rel="rdfs-seeAlso">arsort()</a></li> <li class="member"><a href="function.ksort.html" class="function" rel="rdfs-seeAlso">ksort()</a></li> <li class="member"><a href="function.rsort.html" class="function" rel="rdfs-seeAlso">rsort()</a></li> <li class="member"><a href="function.sort.html" class="function" rel="rdfs-seeAlso">sort()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.sort.html">sort</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.uksort.html">uksort</a></div> <div class="up"><a href="ref.array.html">Array Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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