[PHP-DOC] Mathematical Functions - is_finite()/is_infinite

[Cornelia Boenigk]

Hi 

is_finite -- Finds whether a value is a legal finite number


please., what is a *legal* finite number?

sqrt(2) or pi() are definitively infinite numbers. 
But
is_finite(sqrt(2)) as well as is_finite(pi()) return TRUE. 

In which sense are those values finite? 

Regards
Conni