* Declare class properties before methods;

* Declare public methods first, then protected ones and finally private ones;

* Declare public methods first, then protected ones and finally private ones.

The exceptions to this rule are the class constructor and the ``setUp`` and

``tearDown`` methods of PHPUnit tests, which should always be the first methods

to increase readability.

* Use parentheses when instantiating classes regardless of the number of

arguments the constructor has;