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There are several differences between PHP4 and PHP5.1.Unified constructor and Destructor.2.Exception has been introduced.3.New error level named E_STRICT has been introduced.4.Now we can define full method definintions for a abstract class.4.Within a class we can define class constants.5.we can use the final keyword to indicate that a method cannot be overridden by a child==================
PHP 4 doesn't call constructors of the base class automatically from a constructor of a derived class. It is your responsibility to propagate the call to constructors upstream where appropriate. ==============================Destructors are functions that are called automatically when an object is destroyed, either with unset() or by simply going out of scope. There are no destructors in PHP. You may use register_shutdown_function() instead to simulate most effects of destructors.
==========================An exception can be thrown, and caught ("catched") within PHP. Code may be surrounded in a try block, to facilitate the catching of potential exceptions. Each try must have at least one corresponding catch block. Multiple catch blocks can be used to catch different classes of exeptions.====================================E_STRICTRun-time notices. Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code.
abstrac class. It is not allowed to create an instance of a class that has been defined as abstract. Any class that contains at least one abstract method must also be abstract. Methods defined as abstract simply declare the method's signature they cannot define the implementation