Don't use full qualified class names if not necesarry

Found with PHPStorms static code analysis.

Change-Id: I99bfc9e10e92962ecc5c4fd909a35d1d8094c051
Fix code smell issues in PHP

As reported by PHPStorms static code analysis.

Change-Id: I041b1f354334cb031b4b79af641a9c7b8a539277
Merge "Don't use full qualified class names if not necesarry"
Merge "Fix code smell issues in PHP"