下面這個數組是我訪問本地的 http://xx.xxx.com/index.php?a=1&b=2的結果，也是apache傳遞給PHP的數據參數。
其中，比較重要的是REQUEST_URI這個變量，一般被用於確定請求的地址。
array(28) {
["HTTP_HOST"]=>string(37) "www.xxx.com:8886"
["HTTP_CONNECTION"]=>
string(10) "keep-alive"
["HTTP_ACCEPT"]=>
string(63) "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
["HTTP_USER_AGENT"]=>
string(101) "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31"
["HTTP_ACCEPT_ENCODING"]=>
string(17) "gzip,deflate,sdch"
["HTTP_ACCEPT_LANGUAGE"]=>
string(35) "zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4"
["HTTP_ACCEPT_CHARSET"]=>
string(30) "ISO-8859-1,utf-8;q=0.7,*;q=0.3"
["HTTP_COOKIE"]=>
string(2589) "H_PS_PSSID=2239_1953_1449_1945_2202_1788_2249_2260"
["PATH"]=>
string(345) "/home/work/env/php/bin"
["SERVER_SIGNATURE"]=>
string(0) ""
["SERVER_SOFTWARE"]=>
string(6) "Apache"
["SERVER_NAME"]=>
string(32) "www.xxx.com"
["SERVER_ADDR"]=>
string(12) "xx.xx.xx.xx"
["SERVER_PORT"]=>
string(4) "8886"
["REMOTE_ADDR"]=>
string(13) "xx.xx.xx.xx"
["DOCUMENT_ROOT"]=>
string(46) "/home/work/htoc/app"
["SERVER_ADMIN"]=>
string(18) ""
["SCRIPT_FILENAME"]=>
string(56) "/home/work/htoc/app/index.php"
["REMOTE_PORT"]=>
string(5) "53512"
["GATEWAY_INTERFACE"]=>
string(7) "CGI/1.1"
["SERVER_PROTOCOL"]=>
string(8) "HTTP/1.1"
["REQUEST_METHOD"]=>
string(3) "GET"
["QUERY_STRING"]=>
string(8) "&a=1&b=2"
["REQUEST_URI"]=>
string(10) "/?&a=1&b=2"
["SCRIPT_NAME"]=>
string(10) "/index.php"
["PHP_SELF"]=>
string(10) "/index.php"
["REQUEST_TIME_FLOAT"]=>
float(1367570051.582)
["REQUEST_TIME"]=>
int(1367570051)
}