1、http://localhost/aaa/ (打开aaa中的index.php)
$_SERVER['QUERY_STRING'] = "";
$_SERVER['REQUEST_URI']
$_SERVER['SCRIPT_NAME']
$_SERVER['PHP_SELF']
2、http://localhost/aaa/index.php?p=222&q=333(带参数)
$_SERVER['QUERY_STRING'] = "p=222&q=333";
$_SERVER['REQUEST_URI']
$_SERVER['SCRIPT_NAME']
$_SERVER['PHP_SELF']
3、http://localhost/tag/test → http://localhost/index.php?m=tag&tag=test(URL重写)
$_SERVER['QUERY_STRING'] = "m=tag&tag=test";
$_SERVER['REQUEST_URI']
$_SERVER['SCRIPT_NAME']
$_SERVER['PHP_SELF']
由实例可知:
$_SERVER["QUERY_STRING"]
$_SERVER["REQUEST_URI"]
$_SERVER["SCRIPT_NAME"]
$_SERVER["PHP_SELF"]