显示系统部分环境变量
<HTML>  
<HEAD>  
<TITLE>printenv using PHP</TITLE>  
</HEAD>  

<BODY>  
<H2>printenv using PHP</H2>  

<?  
echo "Hello, $REMOTE_HOSTn<P>n";  
?>  
<P>  
Global variables from $GLOBALS:  
<P>  
<?  
echo "<P>GLOBALS version 1<BR>n";  
while (list(
$key$value) = each($GLOBALS)) {  
echo 
"$key: $value<BR>n";  
}  

echo 
"<P>GLOBALS version 2<BR>n";  

for (
$key=reset($GLOBALS);$key!= "";$key=next($GLOBALS)) {  
echo 
"$GLOBALS[$key] = $key<BR>n";  
}  

echo 
"<P>GLOBALS version 3<BR>n";  
echo 
"REMOTE_HOST = $REMOTE_HOST<BR>n";  
echo 
"SERVER_SOFTWARE = $SERVER_SOFTWARE<BR>n";  
echo 
"GATEWAY_INTERFACE = $GATEWAY_INTERFACE<BR>n";  
echo 
"DOCUMENT_ROOT = $DOCUMENT_ROOT<BR>n";  
echo 
"REMOTE_ADDR = $REMOTE_ADDR<BR>n";  
echo 
"SERVER_PROTOCOL = $SERVER_PROTOCOL<BR>n";  
echo 
"REQUEST_METHOD = $REQUEST_METHOD<BR>n";  
echo 
"HTTP_REFERER = $HTTP_REFERER<BR>n";  
echo 
"QUERY_STRING = $QUERY_STRING<BR>n";  
echo 
"HTTP_USER_AGENT = $HTTP_USER_AGENT<BR>n";  
echo 
"PATH = $PATH<BR>n";  
echo 
"TZ = $TZ<BR>n";  
echo 
"HTTP_CONNECTION = $HTTP_CONNECTION<BR>n";  
/*  
HTTP_ACCEPT = image/gif  
REMOTE_PORT = 3445  
HTTP_ACCEPT_LANGUAGE = en  
SCRIPT_NAME = /cgi-bin/cgiwrap/schmitt/printenv  
SCRIPT_FILENAME = /usr/box/apache/cgi-bin/cgiwrap  
SERVER_NAME = triton.towson.edu  
PATH_INFO =  
REQUEST_URI = /cgi-bin/cgiwrap/schmitt/printenv  
HTTP_ACCEPT_CHARSET = iso-8859-1,*,utf-8  
SERVER_PORT = 80  
HTTP_HOST = triton.towson.edu  
PATH_TRANSLATED =  
SERVER_ADMIN =  
*/  

?>  

</BODY>  
</HTML>