Unexpected T_PAAMAYIM_NEKUDOTAYIM in PHP 5.2.x

Question

I\'m having a hard time understanding why I\'m getting an Unexpected T_PAAMAYIM_NEKUDOTAYIM error in the following code, which seems perfecly valid to me...

Answer 1

Another case :

It may happen on some servers (PHP VERSION ??) if you use: if (empty(NAME_OF_A_CONSTANT)) ...