Most Common $_SERVER Variables

These following list are about most common PHP $_SERVER Variables:

Request Information:

• $_SERVER['REQUEST_METHOD'] - switch the Request method to (e.g. GET, POST, PUT, DELETE, etc.)
• $_SERVER['REQUEST_URI'] - The URI used to access the page
• $_SERVER['QUERY_STRING'] - Query string if accessed via URL

Server Information:

• $_SERVER['SERVER_NAME'] - Server hostname
• $_SERVER['SERVER_ADDR'] - Server IP address
• $_SERVER['SERVER_PORT'] - Port being used (usually 80 or 443)
• $_SERVER['SERVER_SOFTWARE'] - Server identification string

Script Information:

• $_SERVER['PHP_SELF'] - Filename of currently executing script
• $_SERVER['SCRIPT_NAME'] - Path of current script
• $_SERVER['SCRIPT_FILENAME'] - Absolute path of current script
• $_SERVER['DOCUMENT_ROOT'] - Root directory of the server

Client Information:

• $_SERVER['REMOTE_ADDR'] - IP address of the client
• $_SERVER['REMOTE_PORT'] - Port being used by client
• $_SERVER['HTTP_USER_AGENT'] - User agent string of the client
• $_SERVER['HTTP_REFERER'] - Referring page URL (if available)

Protocol Information:

• $_SERVER['HTTPS'] - Set to non-empty value if using HTTPS
• $_SERVER['REQUEST_SCHEME'] - http or https

You can view all available server variables with print_r($_SERVER); or var_dump($_SERVER);

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Bibliography

1. https://www.coursera.org/
2. https://www.engadget.com/
3. https://www.freecodecamp.org
4. https://www.geeksforgeeks.org/
5. https://www.php.net/ ( manual ebook )
6. https://techcrunch.com/
7. https://www.techradar.com/
8. https://teamtreehouse.com/
9. https://www.tutorialspoint.com/
10. https://www.udemy.com/
11. https://www.w3schools.com/
12. Apache HTTP Server ebook;McGraw Hill
13. Apache HTTP Server ebook;In Easy Steps
14. Apache HTTP Server ebook;Packt
15. PHP ebook;Apress
16. PHP ebook;Sitepoint
17. SQL ebook;O'Reilly
18. SQL ebook;Manning
19. SQL ebook;For Dummies