PHP-CALLING MEMBER FUNCTION
In this video we will discuss about calling member function in PHP. After creating object you will be able to call member functions declared in the class. push_back() by itself will attempt to call a push-back function from the global scope, not the push_back in your object. It is not an "object call", it's just a plain-jane function call, just as calling printf or is_readable() within an object calls the usual core PHP functions.