Even with all those advantages, PHP is also known to have some security problems. That's why, i added Suhosin patch into my virtual server to enhance it's security protection. Adding suhosin is an easy task, since it has been described in detail in their documentation page. I can manage to install Suhosin in less than 2 minutes.
For those who seeks for performance improvement, i would suggest you to try eAccelerator and APC. It's also easy to install and configure. I'm able to finish the installation and configuration process in less than 5 minutes.
Just make sure to verify that it has been activated by creating a file with phpinfo() inside of it and ran the file in browser or just use terminal and issue php -v and this is the results:
PHP 5.3.5 (cli) (built: Jan 11 2011 21:51:47)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
with eAccelerator v0.9.6.1, Copyright (c) 2004-2010 eAccelerator, by eAccelerator
with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH