function.split.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>Split string into array by regular expression</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.eregi.html">eregi</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.spliti.html">spliti</a></div> <div class="up"><a href="ref.regex.html">POSIX Regex Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.split" class="refentry"> <div class="refnamediv"> <h1 class="refname">split</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">split</span> — <span class="dc-title">Split string into array by regular expression</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>split</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$pattern</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$string</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$limit</tt></span> ] )</div> <p class="para rdfs-comment"> Splits a <i><tt class="parameter">string</tt></i> into array by regular expression. </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"> Case sensitive regular expression. </p> <p class="para"> If you want to split on any of the characters which are considered special by regular expressions, you'll need to escape them first. If you think <b>split()</b> (or any other regex function, for that matter) is doing something weird, please read the file <var class="filename">regex.7</var>, included in the <var class="filename">regex/</var> subdirectory of the PHP distribution. It's in manpage format, so you'll want to do something along the lines of <strong class="command">man /usr/local/src/regex/regex.7</strong> in order to read it. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">string</tt></i></span> <dd> <p class="para"> The input string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">limit</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">limit</tt></i> is set, the returned array will contain a maximum of <i><tt class="parameter">limit</tt></i> elements with the last element containing the whole rest of <i><tt class="parameter">string</tt></i>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an array of strings, each of which is a substring of <i><tt class="parameter">string</tt></i> formed by splitting it on boundaries formed by the case-sensitive regular expression <i><tt class="parameter">pattern</tt></i>. </p> <p class="para"> If there are <span class="replaceable">n</span> occurrences of <i><tt class="parameter">pattern</tt></i>, the returned array will contain <i><span class="replaceable">n</span>+1</i> items. For example, if there is no occurrence of <i><tt class="parameter">pattern</tt></i>, an array with only one element will be returned. Of course, this is also true if <i><tt class="parameter">string</tt></i> is empty. If an error occurs, <b>split()</b> returns <b><tt>FALSE</tt></b>. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>split()</b> example</b></p> <div class="example-contents"><p> To split off the first four fields from a line from <var class="filename">/etc/passwd</var>: </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">list(</span><span style="color: #0000BB">$user</span><span style="color: #007700">, </span><span style="color: #0000BB">$pass</span><span style="color: #007700">, </span><span style="color: #0000BB">$uid</span><span style="color: #007700">, </span><span style="color: #0000BB">$gid</span><span style="color: #007700">, </span><span style="color: #0000BB">$extra</span><span style="color: #007700">) =<br /> </span><span style="color: #0000BB">split</span><span style="color: #007700">(</span><span style="color: #DD0000">":"</span><span style="color: #007700">, </span><span style="color: #0000BB">$passwd_line</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 <b>split()</b> example</b></p> <div class="example-contents"><p> To parse a date which may be delimited with slashes, dots, or hyphens: </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Delimiters may be slash, dot, or hyphen<br /></span><span style="color: #0000BB">$date </span><span style="color: #007700">= </span><span style="color: #DD0000">"04/30/1973"</span><span style="color: #007700">;<br />list(</span><span style="color: #0000BB">$month</span><span style="color: #007700">, </span><span style="color: #0000BB">$day</span><span style="color: #007700">, </span><span style="color: #0000BB">$year</span><span style="color: #007700">) = </span><span style="color: #0000BB">split</span><span style="color: #007700">(</span><span style="color: #DD0000">'[/.-]'</span><span style="color: #007700">, </span><span style="color: #0000BB">$date</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"Month: $month; Day: $day; Year: $year<br />\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <div class="tip"><b class="tip">Tip</b> <p class="para"> <a href="function.preg-split.html" class="function">preg_split()</a>, which uses a Perl-compatible regular expression syntax, is often a faster alternative to <b>split()</b>. If you don't require the power of regular expressions, it is faster to use <a href="function.explode.html" class="function">explode()</a>, which doesn't incur the overhead of the regular expression engine. </p> </div> <div class="tip"><b class="tip">Tip</b> <p class="para"> For users looking for a way to emulate Perl's <strong class="command">@chars = split('', $str)</strong> behaviour, please see the examples for <a href="function.preg-split.html" class="function">preg_split()</a> or <a href="function.str-split.html" class="function">str_split()</a>. </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.preg-split.html" class="function" rel="rdfs-seeAlso">preg_split()</a></li> <li class="member"><a href="function.spliti.html" class="function" rel="rdfs-seeAlso">spliti()</a></li> <li class="member"><a href="function.str-split.html" class="function" rel="rdfs-seeAlso">str_split()</a></li> <li class="member"><a href="function.explode.html" class="function" rel="rdfs-seeAlso">explode()</a></li> <li class="member"><a href="function.implode.html" class="function" rel="rdfs-seeAlso">implode()</a></li> <li class="member"><a href="function.chunk-split.html" class="function" rel="rdfs-seeAlso">chunk_split()</a></li> <li class="member"><a href="function.wordwrap.html" class="function" rel="rdfs-seeAlso">wordwrap()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.eregi.html">eregi</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.spliti.html">spliti</a></div> <div class="up"><a href="ref.regex.html">POSIX Regex 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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