function.sort.html
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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</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.sizeof.html">sizeof</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.uasort.html">uasort</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.sort" class="refentry"> <div class="refnamediv"> <h1 class="refname">sort</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">sort</span> — <span class="dc-title">Sort an array</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>sort</b></b></span> ( <span class="methodparam"><span class="type">array</span> <tt class="parameter reference">&$array</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$sort_flags</tt></span> ] )</div> <p class="para rdfs-comment"> This function sorts an array. Elements will be arranged from lowest to highest when this function has completed. </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">sort_flags</tt></i></span> <dd> <p class="para"> The optional second parameter <i><tt class="parameter">sort_flags</tt></i> may be used to modify the sorting behavior using these values: </p> <p class="para"> Sorting type flags: <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"><b><tt>SORT_REGULAR</tt></b> - compare items normally (don't change types)</span> </li> <li class="listitem"> <span class="simpara"><b><tt>SORT_NUMERIC</tt></b> - compare items numerically</span> </li> <li class="listitem"> <span class="simpara"><b><tt>SORT_STRING</tt></b> - compare items as strings</span> </li> <li class="listitem"> <span class="simpara"><b><tt>SORT_LOCALE_STRING</tt></b> - compare items as strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2. Before PHP 6, it uses the system locale, which can be changed using <a href="function.setlocale.html" class="function">setlocale()</a>. Since PHP 6, you must use the <b>i18n_loc_set_default()</b> function. </span> </li> </ul> </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 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.0</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">sort_flags</tt></i> parameter was added. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>sort()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />$fruits </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"lemon"</span><span style="color: #007700">, </span><span style="color: #DD0000">"orange"</span><span style="color: #007700">, </span><span style="color: #DD0000">"banana"</span><span style="color: #007700">, </span><span style="color: #DD0000">"apple"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">sort</span><span style="color: #007700">(</span><span style="color: #0000BB">$fruits</span><span style="color: #007700">);<br />foreach (</span><span style="color: #0000BB">$fruits </span><span style="color: #007700">as </span><span style="color: #0000BB">$key </span><span style="color: #007700">=> </span><span style="color: #0000BB">$val</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"fruits[" </span><span style="color: #007700">. </span><span style="color: #0000BB">$key </span><span style="color: #007700">. </span><span style="color: #DD0000">"] = " </span><span style="color: #007700">. </span><span style="color: #0000BB">$val </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>fruits[0] = applefruits[1] = bananafruits[2] = lemonfruits[3] = orange</pre></div> </pre></div> </div> </p> <p class="para"> The fruits have been sorted in alphabetical order. </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara">This functionassigns new keys to the elements in <i><tt class="parameter">array</tt></i>.It will remove any existing keys that may have been assigned, ratherthan just reordering the keys.</span></p></blockquote> <blockquote><p><b class="note">Note</b>: <span class="simpara"> Like most PHP sorting functions, <b>sort()</b> uses an implementation of <a href="http://en.wikipedia.org/wiki/Quicksort" class="link external">» Quicksort</a>. </span> </p></blockquote> <div class="warning"><b class="warning">Warning</b> <p class="simpara"> Be careful when sorting arrays with mixed types values because <b>sort()</b> can produce unpredictable results. </p> </div> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.arsort.html" class="function" rel="rdfs-seeAlso">arsort()</a></li> <li class="member"><a href="function.asort.html" class="function" rel="rdfs-seeAlso">asort()</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.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.array-multisort.html" class="function" rel="rdfs-seeAlso">array_multisort()</a></li> <li class="member"><a href="function.krsort.html" class="function" rel="rdfs-seeAlso">krsort()</a></li> <li class="member"><a href="function.natsort.html" class="function" rel="rdfs-seeAlso">natsort()</a></li> <li class="member"><a href="function.natcasesort.html" class="function" rel="rdfs-seeAlso">natcasesort()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; 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