<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >strstr</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="String 字符串处理函数" HREF="ref.strings.html"><LINK REL="PREVIOUS" TITLE="strspn" HREF="function.strspn.html"><LINK REL="NEXT" TITLE="strtok" HREF="function.strtok.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.strspn.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.strtok.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.strstr" ></A >strstr</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN228208" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >strstr -- Find first occurrence of a string</DIV ><DIV CLASS="refsect1" ><A NAME="AEN228211" ></A ><H2 >Description</H2 >string <B CLASS="methodname" >strstr</B > ( string haystack, string needle )<BR ></BR ><P > Returns part of <CODE CLASS="parameter" >haystack</CODE > string from the first occurrence of <CODE CLASS="parameter" >needle</CODE > to the end of <CODE CLASS="parameter" >haystack</CODE >. </P ><P > If <CODE CLASS="parameter" >needle</CODE > is not found, returns <TT CLASS="constant" ><B >FALSE</B ></TT >. </P ><P > If <CODE CLASS="parameter" >needle</CODE > is not a string, it is converted to an integer and applied as the ordinal value of a character. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > This function is case-sensitive. For case-insensitive searches, use <A HREF="function.stristr.html" ><B CLASS="function" >stristr()</B ></A >. </P ></BLOCKQUOTE ></DIV ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN228235" ></A ><P ><B >例 1. <B CLASS="function" >strstr()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$email </font><font color="#007700">= </font><font color="#DD0000">'user@example.com'</font><font color="#007700">;<br /></font><font color="#0000BB">$domain </font><font color="#007700">= </font><font color="#0000BB">strstr</font><font color="#007700">(</font><font color="#0000BB">$email</font><font color="#007700">, </font><font color="#DD0000">'@'</font><font color="#007700">);<br />echo </font><font color="#0000BB">$domain</font><font color="#007700">; </font><font color="#FF8000">// prints @example.com<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > <DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > If you only want to determine if a particular <CODE CLASS="parameter" >needle</CODE > occurs within <CODE CLASS="parameter" >haystack</CODE >, use the faster and less memory intensive function <A HREF="function.strpos.html" ><B CLASS="function" >strpos()</B ></A > instead. </P ></BLOCKQUOTE ></DIV > </P ><P > <B CLASS="function" >strstr()</B > has been binary safe since PHP 4.3.0 </P ><P > See also <A HREF="function.preg-match.html" ><B CLASS="function" >preg_match()</B ></A >, <A HREF="function.stristr.html" ><B CLASS="function" >stristr()</B ></A >, <A HREF="function.strpos.html" ><B CLASS="function" >strpos()</B ></A >, <A HREF="function.strrchr.html" ><B CLASS="function" >strrchr()</B ></A >, and <A HREF="function.substr.html" ><B CLASS="function" >substr()</B ></A >. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.strspn.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.strtok.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >strspn</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.strings.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >strtok</TD ></TR ></TABLE ></DIV ></BODY ></HTML >