What are autoglobals?
For instance if you send data through a form using the POST method, you will automatically have $_POST made available which is an autoglobal array containing all the keys and values passed through that form through the POST method.
There are several other global variables set this way.
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How do I find the timestamp for a particular date?
How do I find out about my PHP installation?
What is the differece between $message and $$message?
I have lots of if else logic - is there another option?