PHP 5 was launched yesterday -- new features of PHP 5/Zend Engine 2.0

Preface
Today, I suddenly thought of a revolution on the official PHP website and saw the announcement of PHP5 at a glance. Although I have seen the predictions of PHP5 before, I have carefully read the new features of PHP 5/Zend Engine 2.0, and a JAVA atmosphere is coming...
This article was first translated on the CSDN website to attract readers.
New features of PHP 5/Zend Engine 2.0
Xu call Chun translation sfwebsite@hotmail.com
Http://www.php.net/zend-engine-2.php
Brand new Object Model
The object processing part in PHP has been completely rewritten, providing better performance and more functions. In earlier versions of PHP, objects and built-in variable types (such as integer and string) are processed in the same way. The drawback is that when a variable is assigned as an object or an object is passed as a parameter, the result is an object copy. In the new version, an object is referenced by a handle, rather than its value. (The handle can be recognized as the object identifier)
Many PHP programmers may not be aware of the "replication quirks" of the previous object model, so the previous PHP program will run without any changes or just a small change.
Private and protected members
PHP 5 introduces private and protected member variables that can define when class attributes can be accessed.
Example
Class protection member variables can be accessed in the extension class of this class, while private member variables can only be accessed in this class.
<? Php
Class MyClass {
Private $ Hello = "Hello, World! ";
Protected $ Bar = "Hello, Foo! ";
Protected $ Foo = "Hello, Bar! ";
Function printHello (){
Print "MyClass: printHello ()". $ this-> Hello;
Print "MyClass: printHello ()". $ this-> Bar;
Print "MyClass: printHello ()". $ this-> Foo;
    }
}
Class MyClass2 extends MyClass {
Protected $ Foo;
       
Function printHello (){
MyClass: printHello ();/* shocould print */