With sincere gratitude from Webel IT Australia to Drupal CMS. Although it's not perfect, it is very powerful and is very popular with good reason.
There is much debate (see external links) about whether or not one should use constants in an interface.
My opinion is that in PHP it makes good sense to use an interface to encapsulate certain kinds of constants (especially ones that are not likely to change often), and so it is recorded here as a pattern, not an anti-pattern. The tutorial module OOE = Object Oriented Examples = One Of Each makes heavy use of PHP interface constants to promote Don't Repeat Yourself (DRY Principle) coding and avoid Write Everything Twice (WET) (because "we enjoy typing") coding.
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'It ain't necessarily so,
It ain't necessarily so,
The t'ings dat yo' li'ble,
To read in de [Drupal6/7] Bible,
It ain't necessarily so.'
Heresy: Doctrine rejected as false by religious authorities.
Logical fallacy: Appeal to popularity, Argumentum ad populum.
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