<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >getenv</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="PHP Options&Information" HREF="ref.info.html"><LINK REL="PREVIOUS" TITLE="get_required_files" HREF="function.get-required-files.html"><LINK REL="NEXT" TITLE="getlastmod" HREF="function.getlastmod.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.get-required-files.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.getlastmod.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.getenv" ></A >getenv</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN181176" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >getenv -- Gets the value of an environment variable</DIV ><DIV CLASS="refsect1" ><A NAME="AEN181179" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >getenv</B > ( string varname )<BR ></BR ><P > Gets the value of an environment variable. </P ><P > You can see a list of all the environmental variables by using <A HREF="function.phpinfo.html" ><B CLASS="function" >phpinfo()</B ></A >. You can find out what many of them mean by taking a look at the <A HREF="http://hoohoo.ncsa.uiuc.edu/cgi/" TARGET="_top" >CGI specification</A >, specifically the <A HREF="http://hoohoo.ncsa.uiuc.edu/cgi/env.html" TARGET="_top" >page on environmental variables</A >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN181192" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >varname</CODE ></DT ><DD ><P > The variable name. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN181201" ></A ><H2 >返回值</H2 ><P > Returns the value of the environment variable <CODE CLASS="parameter" >varname</CODE >, or <TT CLASS="constant" ><B >FALSE</B ></TT > on an error. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN181206" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN181209" ></A ><P ><B >例 1. <B CLASS="function" >getenv()</B > Example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">// Example use of getenv()<br /></font><font color="#0000BB">$ip </font><font color="#007700">= </font><font color="#0000BB">getenv</font><font color="#007700">(</font><font color="#DD0000">'REMOTE_ADDR'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// Or simply use a Superglobal ($_SERVER or $_ENV)<br /></font><font color="#0000BB">$ip </font><font color="#007700">= </font><font color="#0000BB">$_SERVER</font><font color="#007700">[</font><font color="#DD0000">'REMOTE_ADDR'</font><font color="#007700">];<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN181213" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.putenv.html" ><B CLASS="function" >putenv()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.apache-getenv.html" ><B CLASS="function" >apache_getenv()</B ></A ></TD ></TR ><TR ><TD ><A HREF="language.variables.predefined.html#language.variables.superglobals" >Superglobals</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.get-required-files.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.getlastmod.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >get_required_files</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.info.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >getlastmod</TD ></TR ></TABLE ></DIV ></BODY ></HTML >