function.preg-grep.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>Return array entries that match the pattern</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="ref.pcre.html">PCRE Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.preg-last-error.html">preg_last_error</a></div> <div class="up"><a href="ref.pcre.html">PCRE Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.preg-grep" class="refentry"> <div class="refnamediv"> <h1 class="refname">preg_grep</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">preg_grep</span> — <span class="dc-title">Return array entries that match the pattern</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>preg_grep</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$pattern</tt></span> , <span class="methodparam"><span class="type">array</span> <tt class="parameter">$input</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$flags</tt></span> ] )</div> <p class="para rdfs-comment"> Returns the array consisting of the elements of the <i><tt class="parameter">input</tt></i> array that match the given <i><tt class="parameter">pattern</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">pattern</tt></i></span> <dd> <p class="para"> The pattern to search for, as a string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">input</tt></i></span> <dd> <p class="para"> The input array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">flags</tt></i></span> <dd> <p class="para"> If set to <b><tt>PREG_GREP_INVERT</tt></b>, this function returns the elements of the input array that do <em class="emphasis">not</em> match the given <i><tt class="parameter">pattern</tt></i>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an array indexed using the keys from the <i><tt class="parameter">input</tt></i> array. </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">4.2.0</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">flags</tt></i> parameter was added. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.4</td> <td colspan="1" rowspan="1" align="left"> <p class="para"> Prior to this version, the returned array was indexed regardless of the keys of the <i><tt class="parameter">input</tt></i> array. </p> <p class="para"> If you want to reproduce this old behavior, use <a href="function.array-values.html" class="function">array_values()</a> on the returned array to reindex the values. </p> </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>preg_grep()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// return all array elements<br />// containing floating point numbers<br /></span><span style="color: #0000BB">$fl_array </span><span style="color: #007700">= </span><span style="color: #0000BB">preg_grep</span><span style="color: #007700">(</span><span style="color: #DD0000">"/^(\d+)?\.\d+$/"</span><span style="color: #007700">, </span><span style="color: #0000BB">$array</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.pcre.html">PCRE Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.preg-last-error.html">preg_last_error</a></div> <div class="up"><a href="ref.pcre.html">PCRE 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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