Purpose of PHP constructors

Question

I am working with classes and object class structure, but not at a complex level – just classes and functions, then, in one place, instantiation.

As to __const

Answer 1

I've found it was easiest to grasp when I thought about the new keyword before the constructor: it simply tells my variable a new object of its data type would be give to him, based on which constructor I call and what I pass into it, I can define to state of the object on arrival.

Without the new object, we would be living in the land of null, and crashes!

The Destructor is most obvious from a C++ stand point, where if you dont have a destructor method delete all the memory pointed to, it will stay used after the program exits causing leaks and lag on the clients OS untill next reboot.

I'm sure there's more than enough good information here, but another angle is always helpful from what I've noticed!