HTTP authentication is the easiest way to make a page or area of a website secure. It's very easy to accomplish with pure PHP, so no web server configuration is required making it a lot more portable.
This function implements a very simple HTTP Basic Auth authentication system. Simply call it before you do anything else in your script, pass it an array of valid users (username => password), an optional description of what's being secured and it will do the rest.
Example usage:
Note that the function doesn't return anything or throw any exceptions. If it can't validate the user it will end the script after sending back an appropriate response.
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