Question:What are configuration directives and scopes? Write an example for each scope. 

Question:Write all bitwise operators in term of PHP. 

Question:What is datatype? Write variable scope with an example for each scope. 

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

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