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What does the __FILE__ constant contain?

What can prevent PHP from being able to open a file on the hard drive (Choose 2)?

What purpose do namespaces fulfill?

When would you use classes and when would you use namespaces?

Which of these elements can be encapsulated by namespaces and made accessible from the outside?

What is the output of the following code?echo '1' . (print '2') + 3;