Optimising PHP:
http://www.oracle.com/technology/pub/articles/deployphp/alshanetsky_deployphp.html∞

Optimising PHP (alt):
http://phplens.com/lens/php-book/optimizing-debugging-php.php∞

PHP Security check:
http://phpsec.org/projects/∞

PHP mail Header Patch:
http://choon.net/php-mail-header.php∞?

Hardened PHP Project:
http://www.hardened-php.net/suhosin.127.html∞

PHP mail function loop holes:
http://www.phpbuilder.com/columns/ian_gilfillan20060412.php3∞

Upgrading to php5 in plesk: (not via rpm!)
http://forums.hostmysite.com/post-16942.html∞

Upgrading to php5 in plesk: (rpm way)
http://www.hosticananswers.com/questions/232/∞

PHP Dynamic settings via .htaccess :
http://support.easystreet.com/hosting/unix/dynamic-config.htm∞

PHP register_globals:
http://www.itc.virginia.edu/desktop/web/php4registerglobal.html∞

PHP magic quotes gpc:
http://www.vbulletin.com/forum/showthread.php?t=37720∞

php_flag display_errors on
php_value error_reporting 7

php_value magic_quotes_gpc 1
php_value register_globals 0