Single VS Double Quotes

In PHP, single quotes treat everything inside as plain text, so variables or special characters aren't processed. Double quotes allow variables and escape sequences to be interpreted. So, with double quotes, PHP can replace variables with their values inside the string.

Debugging Techniques

Basic debugging techniques include using echo or print statements to check variable values and see where the code might be going wrong. You can also check error messages to understand what part of the code caused the issue.

What is $_SERVER?

$_SERVER is a PHP superglobal array that holds information about the server and the current request. It includes details like the browser being used, the IP address of the user, and the page they requested. This data helps interact with the environment where your script is running.