Useful article on 10 useful signs to identify crappy PHP project. A summary list,

The software tries to reinvent the object model, or “fix” language features.
The code includes user defined global variables
Scattered HTML and SQL
Classes do too much
Lots of properties are public or lots of properties are static
Multiple levels of inheritance
The authors try to use [...]

Easy and good reading, back to work after an easy weekend.  7 dirtiest jobs in the IT from ComputerWorld.