function.explode.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 a string by string</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.echo.html">echo</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.fprintf.html">fprintf</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.explode" class="refentry"> <div class="refnamediv"> <h1 class="refname">explode</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">explode</span> — <span class="dc-title">Split a string by string</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>explode</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$delimiter</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$string</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$limit</tt></span> ] )</div> <p class="para rdfs-comment"> 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 string <i><tt class="parameter">delimiter</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">delimiter</tt></i></span> <dd> <p class="para"> The boundary string. </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 rest of <i><tt class="parameter">string</tt></i>. </p> <p class="para"> If the <i><tt class="parameter">limit</tt></i> parameter is negative, all components except the last -<i><tt class="parameter">limit</tt></i> are returned. </p> </dd> </dt> </dl> </p> <p class="para"> Although <a href="function.implode.html" class="function">implode()</a> can, for historical reasons, accept its parameters in either order, <b>explode()</b> cannot. You must ensure that the <i><tt class="parameter">delimiter</tt></i> argument comes before the <i><tt class="parameter">string</tt></i> argument. </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> If <i><tt class="parameter">delimiter</tt></i> is an empty string (""), <b>explode()</b> will return <b><tt>FALSE</tt></b>. If <i><tt class="parameter">delimiter</tt></i> contains a value that is not contained in <i><tt class="parameter">string</tt></i>, then <b>explode()</b> will return an array containing <i><tt class="parameter">string</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">5.1.0</td> <td colspan="1" rowspan="1" align="left"> Support for negative <i><tt class="parameter">limit</tt></i>s was added </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.1</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">limit</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>explode()</b> examples</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">// Example 1<br /></span><span style="color: #0000BB">$pizza </span><span style="color: #007700">= </span><span style="color: #DD0000">"piece1 piece2 piece3 piece4 piece5 piece6"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$pieces </span><span style="color: #007700">= </span><span style="color: #0000BB">explode</span><span style="color: #007700">(</span><span style="color: #DD0000">" "</span><span style="color: #007700">, </span><span style="color: #0000BB">$pizza</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$pieces</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]; </span><span style="color: #FF8000">// piece1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$pieces</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]; </span><span style="color: #FF8000">// piece2<br /><br />// Example 2<br /></span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #DD0000">"foo:*:1023:1000::/home/foo:/bin/sh"</span><span style="color: #007700">;<br />list(</span><span style="color: #0000BB">$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">$gid</span><span style="color: #007700">, </span><span style="color: #0000BB">$gecos</span><span style="color: #007700">, </span><span style="color: #0000BB">$home</span><span style="color: #007700">, </span><span style="color: #0000BB">$shell</span><span style="color: #007700">) = </span><span style="color: #0000BB">explode</span><span style="color: #007700">(</span><span style="color: #DD0000">":"</span><span style="color: #007700">, </span><span style="color: #0000BB">$data</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$user</span><span style="color: #007700">; </span><span style="color: #FF8000">// foo<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$pass</span><span style="color: #007700">; </span><span style="color: #FF8000">// *<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 <i><tt class="parameter">limit</tt></i> parameter examples</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'one|two|three|four'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// positive limit<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">explode</span><span style="color: #007700">(</span><span style="color: #DD0000">'|'</span><span style="color: #007700">, </span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// negative limit (since PHP 5.1)<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">explode</span><span style="color: #007700">(</span><span style="color: #DD0000">'|'</span><span style="color: #007700">, </span><span style="color: #0000BB">$str</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">));<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] => one [1] => two|three|four)Array( [0] => one [1] => two [2] => three)</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function isbinary-safe.</span></p></blockquote> </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.str-split.html" class="function" rel="rdfs-seeAlso">str_split()</a></li> <li class="member"><a href="function.str-word-count.html" class="function" rel="rdfs-seeAlso">str_word_count()</a></li> <li class="member"><a href="function.strtok.html" class="function" rel="rdfs-seeAlso">strtok()</a></li> <li class="member"><a href="function.implode.html" class="function" rel="rdfs-seeAlso">implode()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; 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