function.preg-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 by a 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="ref.pcre.html">PCRE Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="book.regex.html">POSIX Regex</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-split" class="refentry"> <div class="refnamediv"> <h1 class="refname">preg_split</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">preg_split</span> — <span class="dc-title">Split string by a 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>preg_split</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$pattern</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$subject</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$limit</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$flags</tt></span> ]] )</div> <p class="para rdfs-comment"> Split the given string by a 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"> The pattern to search for, as a string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">subject</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 specified, then only substrings up to <i><tt class="parameter">limit</tt></i> are returned, and if <i><tt class="parameter">limit</tt></i> is -1, it actually means "no limit", which is useful for specifying the <i><tt class="parameter">flags</tt></i>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">flags</tt></i></span> <dd> <p class="para"> <i><tt class="parameter">flags</tt></i> can be any combination of the following flags (combined with bitwise | operator): <dl> <dt> <span class="term"><b><tt>PREG_SPLIT_NO_EMPTY</tt></b></span> <dd> <span class="simpara"> If this flag is set, only non-empty pieces will be returned by <b>preg_split()</b>. </span> </dd> </dt> <dt> <span class="term"><b><tt>PREG_SPLIT_DELIM_CAPTURE</tt></b></span> <dd> <span class="simpara"> If this flag is set, parenthesized expression in the delimiter pattern will be captured and returned as well. </span> </dd> </dt> <dt> <span class="term"><b><tt>PREG_SPLIT_OFFSET_CAPTURE</tt></b></span> <dd> <p class="para"> If this flag is set, for every occurring match the appendant string offset will also be returned. Note that this changes the return value in an array where every element is an array consisting of the matched string at offset <i>0</i> and its string offset into <i><tt class="parameter">subject</tt></i> at offset <i>1</i>. </p> </dd> </dt> </dl> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an array containing substrings of <i><tt class="parameter">subject</tt></i> split along boundaries matched by <i><tt class="parameter">pattern</tt></i>. </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">4.3.0</td> <td colspan="1" rowspan="1" align="left"> The <b><tt>PREG_SPLIT_OFFSET_CAPTURE</tt></b> was added </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.5</td> <td colspan="1" rowspan="1" align="left"> The <b><tt>PREG_SPLIT_DELIM_CAPTURE</tt></b> was added </td> </tr> <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">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>preg_split()</b> example : Get the parts of a search string</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">// split the phrase by any number of commas or space characters,<br />// which include " ", \r, \t, \n and \f<br /></span><span style="color: #0000BB">$keywords </span><span style="color: #007700">= </span><span style="color: #0000BB">preg_split</span><span style="color: #007700">(</span><span style="color: #DD0000">"/[\s,]+/"</span><span style="color: #007700">, </span><span style="color: #DD0000">"hypertext language, programming"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 Splitting a string into component characters</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'string'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$chars </span><span style="color: #007700">= </span><span style="color: #0000BB">preg_split</span><span style="color: #007700">(</span><span style="color: #DD0000">'//'</span><span style="color: #007700">, </span><span style="color: #0000BB">$str</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">PREG_SPLIT_NO_EMPTY</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$chars</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #3 Splitting a string into matches and their offsets</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'hypertext language programming'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$chars </span><span style="color: #007700">= </span><span style="color: #0000BB">preg_split</span><span style="color: #007700">(</span><span style="color: #DD0000">'/ /'</span><span style="color: #007700">, </span><span style="color: #0000BB">$str</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">PREG_SPLIT_OFFSET_CAPTURE</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$chars</span><span style="color: #007700">);<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>Array( [0] => Array ( [0] => hypertext [1] => 0 ) [1] => Array ( [0] => language [1] => 10 ) [2] => Array ( [0] => programming [1] => 19 ))</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <div class="tip"><b class="tip">Tip</b> <p class="para"> If you don't need the power of regular expressions, you can choose faster (albeit simpler) alternatives like <a href="function.explode.html" class="function">explode()</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.spliti.html" class="function" rel="rdfs-seeAlso">spliti()</a></li> <li class="member"><a href="function.split.html" class="function" rel="rdfs-seeAlso">split()</a></li> <li class="member"><a href="function.implode.html" class="function" rel="rdfs-seeAlso">implode()</a></li> <li class="member"><a href="function.preg-match.html" class="function" rel="rdfs-seeAlso">preg_match()</a></li> <li class="member"><a href="function.preg-match-all.html" class="function" rel="rdfs-seeAlso">preg_match_all()</a></li> <li class="member"><a href="function.preg-replace.html" class="function" rel="rdfs-seeAlso">preg_replace()</a></li> </ul> </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="book.regex.html">POSIX Regex</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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