PHP 7 new hashtable implementation

“As part of the work on the upcoming PHP 7, large parts of the Zend Engine have been rewritten with a focus on smaller data structures requiring fewer allocations. In this article I will provide an overview of the new hashtable implementation and show why it is more efficient than the previous implementation.”

Read more at:

http://nikic.github.io/2014/12/22/PHPs-new-hashtable-implementation.html