PHP gets better and better all the time, 5.4 and 5.5 have really impressive features - but also improved security and performance. This presentation aimed to combine tastes of the features that were added in PHP 5.3, 5.4 and 5.5 - but to combine these promises of a better life with practical advice on how to get from your current platform (whatever it is!) and catch up with the good stuff.
PS PHP 5.2 has been end of life for some years. Please upgrade!