Diff. between PHP 4 and PHP 5 ?

[satees]

Friends,

Can explain the key difference between PHP4 and PHP5 ?

Thanks,
Satees

[steven]

http://fr3.php.net/manual/en/migration5.php
http://fr3.php.net/ChangeLog-5.php

Namely, PHP5 now uses the new Zend engine, which gives it more of the OOP goodness than it had with version 4. In general the major difference is just OOP additions. Most PHP4 code should work out of the box in PHP5, with at most, some minor modifications.