<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >define</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="Miscellaneous Functions" HREF="ref.misc.html"><LINK REL="PREVIOUS" TITLE="constant" HREF="function.constant.html"><LINK REL="NEXT" TITLE="defined" HREF="function.defined.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.constant.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.defined.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.define" ></A >define</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN125217" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >define -- Defines a named constant</DIV ><DIV CLASS="refsect1" ><A NAME="AEN125220" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >define</B > ( string name, mixed value [, bool case_insensitive] )<BR ></BR ><P > Defines a named constant at runtime. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN125235" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >name</CODE ></DT ><DD ><P > The name of the constant. </P ></DD ><DT ><CODE CLASS="parameter" >value</CODE ></DT ><DD ><P > The value of the constant. </P ></DD ><DT ><CODE CLASS="parameter" >case_insensitive</CODE ></DT ><DD ><P > If set to <TT CLASS="constant" ><B >TRUE</B ></TT >, the constant will be defined case-insensitive. The default behaviour is case-sensitive; i.e. <TT CLASS="literal" >CONSTANT</TT > and <TT CLASS="literal" >Constant</TT > represent different values. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN125257" ></A ><H2 >返回值</H2 ><P > 如果成功则返回 <TT CLASS="constant" ><B >TRUE</B ></TT >,失败则返回 <TT CLASS="constant" ><B >FALSE</B ></TT >。 </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN125262" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN125265" ></A ><P ><B >例 1. Defining Constants</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />define</font><font color="#007700">(</font><font color="#DD0000">"CONSTANT"</font><font color="#007700">, </font><font color="#DD0000">"Hello world."</font><font color="#007700">);<br />echo </font><font color="#0000BB">CONSTANT</font><font color="#007700">; </font><font color="#FF8000">// outputs "Hello world."<br /></font><font color="#007700">echo </font><font color="#0000BB">Constant</font><font color="#007700">; </font><font color="#FF8000">// outputs "Constant" and issues a notice.<br /><br /></font><font color="#0000BB">define</font><font color="#007700">(</font><font color="#DD0000">"GREETING"</font><font color="#007700">, </font><font color="#DD0000">"Hello you."</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">);<br />echo </font><font color="#0000BB">GREETING</font><font color="#007700">; </font><font color="#FF8000">// outputs "Hello you."<br /></font><font color="#007700">echo </font><font color="#0000BB">Greeting</font><font color="#007700">; </font><font color="#FF8000">// outputs "Hello you."<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN125268" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.defined.html" ><B CLASS="function" >defined()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.constant.html" ><B CLASS="function" >constant()</B ></A ></TD ></TR ><TR ><TD >The section on <A HREF="language.constants.html" >Constants</A ></TD ></TR ></TBODY ></TABLE ><P ></P > </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.constant.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.defined.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >constant</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.misc.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >defined</TD ></TR ></TABLE ></DIV ></BODY ></HTML >