How do you use the $_SERVER superglobal in PHP?

By directly accessing the desired element in the $_SERVER array using its key.
By using the $_SERVER array as an argument to a function.
By assigning the value of an element in the $_SERVER array to a local variable.
By iterating over the elements in the $_SERVER array using a loop.

To use the $_SERVER superglobal in PHP, you can directly access the desired element in the $_SERVER array using its key. For example, to access the current script filename, you can use $_SERVER['PHP_SELF']. The $_SERVER array is available in the global scope, and its elements can be accessed throughout your PHP script. Learn more: https://www.php.net/manual/en/reserved.variables.server.php

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