what does a ! do?

[benracer]

this is probally a stupid question but what does a "!" do before empty() and isset()?

Thanks

[zabmilenko]

It means "not" - negation. Turns true into false.'

See comparison operators (edit: or NogDog's link below, it's better)

[NogDog]

! == NOT

See http://www.php.net/manual/en/language.operators.logical.php

[benracer]

What is the proper name for this, where could i look on php.net

[benracer]

sorry didnt see last post!