Bad example if ($age > 18)

Question

good examle:

if ($age >= 18)

Answer 1

in what context?

Answer 2

?
I don't understand, both are good, it depends on the situation. In most situations I'd use ($age > 18) so I can check if my user is an adult or not.

Answer 3

Both are good, simply by the fact than in integer context $age >=18 is strictly equivalent to $age > 17...

In a floating point context, that's not strictly equivalent, but > or >= are good or bad depending of the context, not in absolute ^^