Design Patterns for Humans – An ultra-simplified explanation
github.com
github.com
I also liked the examples of each design pattern found in "everyday situations" - a tea stall making batches of tea for the "flyweight" pattern, etc.
There seems to be an effort to put it up as a website, and to include other languages. Please let us know when there's more progress on it!
I haven't written PHP since PHP 5 - it looks rather different from what I remember.