[fubu]

http://dev.mysql.com/doc/refman/5.1/en/myisam-storage-engine...

See "Foreign key support" in MyISAM

Also, in my experience a lot of people do not always use the underlying database constraints even in InnoDB.

Not sure if that was the intent of the authors, but just so that others may understand that it could be more than just "PHP land". Might be a little closer to "MySQL land".

[dreamweapon]

The point is that fundamentally overpowered features of this sort, while potentially quite useful (in some cases), should be optional (and the default setting should point to the non-enabled case).

Being as they can certainly make for very rude surprises, when you discover them by chance.

[fubu]

Ah, I missed that part of your statement. Snarky comments like "PHP land" while clever and gives us all a big chuckle can be a bit difficult to understand in context. If you actually want someone to understand what you are saying, subtle digs and pretentious put downs, while funny and I'm sure make you feel better about yourself, don't really contribute much beyond dividing people and making others feel bad.