PHP Tutorials - Herong's Tutorial Examples - v5.13, by Dr. Herong Yang
Web Server Information in $_SERVER
This section provides a tutorial example on how to dump Web server information stored in the $_SERVER array.
Now, let's run HttpRequestDetails.php on the local Apache Web server. First copy HttpRequestDetails.php to \apache\htdocs, then run Internet Explorer (IE) with http://localhost/HttpRequestDetails.php. You should get:
Contents of $_GET: Contents of $_POST: Contents of $_COOKIE: Contents of $_REQUEST: Contents of $_SERVER: REDIRECT_HANDLER = application/x-httpd-php REDIRECT_STATUS = 200 HTTP_HOST = localhost HTTP_CONNECTION = keep-alive HTTP_UPGRADE_INSECURE_REQUESTS = 1 HTTP_REFERER = http://localhost/ HTTP_ACCEPT_ENCODING = gzip, deflate, br HTTP_ACCEPT_LANGUAGE = en-US,en;q=0.9 SystemRoot = C:\windows COMSPEC = C:\windows\system32\cmd.exe PATHEXT = .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC WINDIR = C:\windows SERVER_SIGNATURE = SERVER_SOFTWARE = Apache/2.4.37 (Win64) SERVER_NAME = localhost SERVER_ADDR = ::1 SERVER_PORT = 80 REMOTE_ADDR = ::1 DOCUMENT_ROOT = C:/apache/htdocs ......
Note that $_GET, $_POST, $_COOKIE, and $_REQUEST are still all empty, because HTTP request contains no information submitted using the GET or POST method. And there are no cookies in the HTTP request.
However, other information contained in the HTTP request and gathered from the Web server is stored in the $_SERVER array now. For example, "DOCUMENT_ROOT = c:/apache/htdocs" is piece of information from the Web server telling us that the Web server picks up HTTP documents and scripts from the c:/apache/htdocs directory.
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