Question:What are superglobals ? Give an example for each? 

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Question:
Briefly describe the following PHP function with a suitable example:
array_shift()
isset()
preg_match()
fopen()
file_put_content()
list()
explode()
vprintf()
 

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Question:What are the terms Encapsulation, Inheritance, and Polymorphism? Show all with and code example indicating by comments. 

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