Script type checking for basic types

Hi All,

I would like to verify if the value contained in a script variable is of which of the basic types(int,string,float,bool).

e.g: $a = 5; //int type
$b = "hello"; //string type
$c = true; //bool type
$d = 3.49; //float type

Can some one tell me the best way to do this type checking in script?

Thanks