Is there any way to initialize a class public variable at the time of object creation. But the case is that I have a child class and I dont want to over ride the parent constrctor. So is there any way out or any function that will be called at the time of object implicitly.

Thanks In advance

http://us3.php.net/manual/en/language.oop5.decon.php
Unless you have created a constructor that overrides the parent constructor it will use the inherited method

I don't think there is anything else called by the PHP engine during instantiation of a class except for the constructor.

I think the question is why you don't want to override the parent. If the child class calls the parents constructor within its own constructor, then its just like not overriding the parent, except that you have are few more function calls.