Question:How do we invoke member functions and property in OOP? 

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Question:How do we invoke parent Constructors? 

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Question:What is type hinting? 

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Question:What are method scopes? 

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Question:How do we define method in the class? Show with general syntax. 

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Question:What are Property Scopes? 

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Question:How we declare static class member? 

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Question:
Briefly describe the following methods:
class_exists()
is_a()
is_subclass_of()
method_exists()
interface_exists()
get_parent_class()
 

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Question:What are the PHP’s authentication variables? 

PHP uses two predefined variables to authenticate a user and those are $_SERVER['PHP_AUTH_USER'] and $_SERVER['PHP_AUTH_PW']. These variables store the username and password values, respectively.

Question:What are the two regular expression syntaxes? 

There are two regular expression syntaxes in php. These are 1. POSIX syntax and 2. Perl syntax.