PHP $_SERVER学习

初学PHP,对$_SERVER这个东西很感兴趣.在网上找了N长时间.是我智商有问题? 还是?
呵呵.干脆不如自己一个一个看...
我的IDE环境: Xmapp省着自己配置了...
//功能:打印$_SERVER->Array();
/*PHP Code Star*/
foreach ($_SERVER as $key => $value)
{
 echo $key.":".$value."<br>";
}
/*PHP Code End*/
//以下带都不知道是干嘛用的.慢慢看...
AuthDigestEnableQueryStringHack:On
HTTP_ACCEPT:*/*
HTTP_ACCEPT_LANGUAGE:zh-cn  //显示浏览器版本?
HTTP_UA_CPU:x86
HTTP_ACCEPT_ENCODING:gzip, deflate
HTTP_USER_AGENT:Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)  //显示浏览器版本?
HTTP_HOST:localhost   //PHP获取主机路径
HTTP_CONNECTION:Keep-Alive
HTTP_COOKIE:sid=ca55choSI%252BIj9fhFbdXv66pWalTp73LPveTd0EvrrT00lCqYCvi%252Fdih9acwWFkWuOJKdIf5PM4pmtw; uchome_auth=91c0L8b7VtmBvqB7DynICPyLxYBxuMiPbfw%2FggPs0tGd%2FmisuYCK6SUs0Ro43p5CCRlU%2F3BxPYLnG5yTmIV1  //哈哈 $_Cookie的Array(),这次我看你往哪儿跑!
PATH:C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem
SystemRoot:C:\WINDOWS //这个很危险
COMSPEC:C:\WINDOWS\system32\cmd.exe  //这个更危险!
PATHEXT:.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
WINDIR:C:\WINDOWS
SERVER_SIGNATURE:
Apache/2.2.9 (Win32) DAV/2 mod_ssl/2.2.9 OpenSSL/0.9.8i mod_autoindex_color PHP/5.2.6 Server at localhost Port 80 //这个最好不隐藏掉
SERVER_SOFTWARE:Apache/2.2.9 (Win32) DAV/2 mod_ssl/2.2.9 OpenSSL/0.9.8i mod_autoindex_color PHP/5.2.6 //同样也要隐藏掉
//以下就是重点了!慢慢啃!!
SERVER_NAME:localhost
SERVER_ADDR:127.0.0.1
SERVER_PORT:80
REMOTE_ADDR:127.0.0.1
DOCUMENT_ROOT:E:/xampp/htdocs
SERVER_ADMIN:admin@localhost
SCRIPT_FILENAME:E:/xampp/htdocs/mysite/index.php
REMOTE_PORT:4858
GATEWAY_INTERFACE:CGI/1.1
SERVER_PROTOCOL:HTTP/1.1
REQUEST_METHOD:GET
QUERY_STRING:
REQUEST_URI:/mysite/
SCRIPT_NAME:/mysite/index.php
PHP_SELF:/mysite/index.php
REQUEST_TIME:1252069158
argv:Array
argc:0