• Classes must be named by following the naming conventions.

• The brace is always written right after the class name (or interface declaration).

• Every class must have a documentation block that conforms to the PHPDocumentor standard.

• Any code within a class must be indented four spaces.

• Only one class is permitted per PHP file.

• Placing additional code in a class file is NOT permitted.

This is an example of an acceptable class declaration: /** * Documentation here */ class Doctrine_SampleClass { // entire content of class // must be indented four spaces }