function.strstr.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>Find first occurrence of a 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.strspn.html">strspn</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.strtok.html">strtok</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.strstr" class="refentry"> <div class="refnamediv"> <h1 class="refname">strstr</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">strstr</span> — <span class="dc-title">Find first occurrence of a string</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>strstr</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$haystack</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$needle</tt></span> [, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$before_needle</tt></span> ] )</div> <p class="para rdfs-comment"> Returns part of <i><tt class="parameter">haystack</tt></i> string from the first occurrence of <i><tt class="parameter">needle</tt></i> to the end of <i><tt class="parameter">haystack</tt></i>. </p> <blockquote><p><b class="note">Note</b>: This function is case-sensitive. For case-insensitive searches, use <a href="function.stristr.html" class="function">stristr()</a>. <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: If you only want to determine if a particular <i><tt class="parameter">needle</tt></i> occurs within <i><tt class="parameter">haystack</tt></i>, use the faster and less memory intensive function <a href="function.strpos.html" class="function">strpos()</a> instead. <br /> </p></blockquote> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">haystack</tt></i></span> <dd> <p class="para"> The input string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">needle</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">needle</tt></i> is not a string, it is converted to an integer and applied as the ordinal value of a character. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">before_needle</tt></i></span> <dd> <p class="para"> If <b><tt>TRUE</tt></b> (the default is <b><tt>FALSE</tt></b>), <b>strstr()</b> returns the part of the <i><tt class="parameter">haystack</tt></i> before the first occurence of the <i><tt class="parameter">needle</tt></i>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the portion of string, or <b><tt>FALSE</tt></b> if <i><tt class="parameter">needle</tt></i> is not found. </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">5.3.0</td> <td colspan="1" rowspan="1" align="left"> Added the optional parameter <i><tt class="parameter">before_needle</tt></i>. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.3.0</td> <td colspan="1" rowspan="1" align="left"> <b>strstr()</b> was made binary safe. </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>strstr()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$email </span><span style="color: #007700">= </span><span style="color: #DD0000">'name@example.com'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$domain </span><span style="color: #007700">= </span><span style="color: #0000BB">strstr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'@'</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$domain</span><span style="color: #007700">; </span><span style="color: #FF8000">// prints @example.com<br /><br /></span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">strstr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'@'</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">); </span><span style="color: #FF8000">// As of PHP 5.3.0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$user</span><span style="color: #007700">; </span><span style="color: #FF8000">// prints name<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.preg-match.html" class="function" rel="rdfs-seeAlso">preg_match()</a></li> <li class="member"><a href="function.stristr.html" class="function" rel="rdfs-seeAlso">stristr()</a></li> <li class="member"><a href="function.strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a></li> <li class="member"><a href="function.strrchr.html" class="function" rel="rdfs-seeAlso">strrchr()</a></li> <li class="member"><a href="function.substr.html" class="function" rel="rdfs-seeAlso">substr()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.strspn.html">strspn</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.strtok.html">strtok</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></body></html>⌨️ 快捷键说明
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