PHP 5.3.0 released on Jun 2009.

PHP 5.5, What’s New?

Latest -> Cool ٩(^ᴗ^)۶

Performance gain 10-30% (?)
Better garbage collection (reduce memory usage), up to 50%  (?) <?>

Reuse methods across classes with `Traits`

New SessionHander() class

Generator:

keyword `finally` in try{}catch(){}

Quick Get value (Bits and Bobs):

Support using:

Support list in foreach

Simplified password hashing

Class member access on object instantiation

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* Important! Check PHP Compatibility.