On april 22th 2013 I delivered a free lecture about PHP. The lecture took place in HIT. You can download the slides I was using during the lecture. You can find (within the slides) the links we mention during the lecture. For a smooth start I recommend on starting with learning the basics www.phpbook.co.il.

Stable Values in Java (JEP 502): Deferred Immutability with JVM Trust
Explore Stable Values – a new Java 25 upcoming feature (JEP 502) enabling lazy initialization with immutable performance and JVM-level optimizations.