I found this question which is pretty old: Is it possible to deploy cakephp applications on google app engine?
Some people stated, that it's most likely at least complicated - someone in the comments stated, that google supports php now(2013). Regarding to the google documentation: https://cloud.google.com/appengine/docs/php/ it's still beta.
So my question is: did someone ever successfully deploy a cakephp application on google app engine? Is it now(2015) possible to deploy a app there without too much problems?