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Differences between php4 and php5

These are some of the differences i know between php4 and php5:

1. PHP5 supports more oops concepts like access specifiers and inheritance
2. we can pass objects by reference in php5 (using clone keyword)
3. Exception class included in PHP5 (try and catch)
4. More XML related functions like SimpleXML were included in PHP5 for easy 
processing of XML data
5. PHP4 uses Zend engine 1.0 as a parser.PHP5 uses Zend engine 2.0
6. php 5 has improvements in design, security and stablity
7. Magic methods have been included in php5
8. Unified Constructors and Destructors in php5
9. There is a new error level defined as E_STRICT in php5 
(notifies deprecated code)
10. Final keyword in php5 indicates that a method cannot be overridden by a 
child
Note: It is said that PHP5 has Backward compatibility issues with php4.


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  1. rajAugust 25, 2011 at 4:28 AM

    what is extra inbuit function in php5

    ReplyDelete
  2. dskanthSeptember 1, 2011 at 1:42 AM

    Hi, you can refer this:
    http://www.slideshare.net/yehg.org/php-builtin-string-validation-functions

    ReplyDelete

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