What is the difference between PhP4 & PhP5 ?

There are many differences between PHP4 and PHP5-

1. PHP5 was powered by Zend Engine II,while PHP4 was powered by Zend Engine 1.0
2. In PHP5 abstract classes are used but not used in PHP4.
3. In PHP5 interfaces are used but not used in PHP4.
4. In PHP5 visibility are used but not used in PHP4.
5. In PHP5 magic methods (such as __call, __get, __set and __toString)are used but not uesd in PHP4.
6. In PHP5 typehinting are used but not used in PHP4.
7. In PHP5 incorporates static methods and properties.
8. In PHP5 cloning are used but not used in PHP4.
9. In PHP5 construtor are written as __construct keyword but in PHP4 are written as class name.
10. In PHP5 special function intorduces called __autoload()
11. In PHP5 there is new error level defined as ‘E_STRICT’
12. In PHP5 there is new default extensions such as SimpleXML, DOM and XSL, PDO, and Hash.
13. In PHP5 a new MySQL extension named MySQLi for developers using MySQL 4.1 and later.
14. In PHP5, SQLite has been bundled with PHP.

Posted by Amit Tiwari