Everything has limitations or disadvantages and PHP is no exception. The following are the limitations of PHP (so be WARNED !!)
1. PHP is NOT 100 % pure Object Oriented scripting language. PHP is good if your PHP code size does not exceed 3,00,000 lines. Maintainence of PHP code greater than 1,00,000 lines becomes more difficult.
2. PHP will NOT give the performance of “C” or “C++” language. Because it is scripting language and is interpreted it will be a bit slower than the optimized “C++” programs. For top performance, you should use “C++” and fast-CGI with database/webserver connection pooling and use C++ compiler optimizer “-O3″ options. Zend optimizer in PHP 4 will speed up the performance of PHP to certain extent.
On the other hand, PHP has lot of advantages and it’s advantages outweigh it’s limitations :
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Apache’s ErrorDocument directive can come in handy. For example, this line in your Apache configuration file:
ErrorDocument 404 /error.php
Can be used to redirect all 404 errors to a PHP script. The following server variables are of interest:
1. $REDIRECT_ERROR_NOTES – File does not exist: /docroot/bogus
2. $REDIRECT_REQUEST_METHOD – GET
3. $REDIRECT_STATUS – 404
4. $REDIRECT_URL – /docroot/bogus
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No matter what language you are familiar with, this book will benefit you. Beginning with a rapid introduction to PHP’s syntax and basic functionality, you will swiftly understand PHP. The book then steers you toward advanced issues, like PHP’s role in database manipulation, sessions, and user interactivity.Author W.J. Gilmore also examines how PHP can work with XML, JavaScript, and the Component Object Model (COM). He loads the book with practical examples and several projects that can be immediately incorporated on any website. The invaluable A Programmer’s Introduction to PHP 4.0 shows you how to make the most of PHP’s powerful capabilities, regardless of your current scope of PHP knowledge.
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