Which of the following statement is correct?

Correct way to profile a PHP function (without relying on 3rd party libraries and/or PHP extensions)?

The extent to which proximate procedures are related to one another is known as

What super-global should be used to access information about uploaded files via a POST request?

What code to use to obtain an array of response headers for a given URL, indexed by their respective names?

Difference between 'echo' and 'print' in PHP?

Which PHP function will return an array of values from $start to $end.

How to determine whether the variable’s value is either TRUE or FALSE?

The comparison $a xor $b evaluates to...

If one wants to convert all double quotes ('') to a backslash followed by a double quote (\'') which of the following can be used?

What function creates a cookie?