@NUMERIC
@NUMERIC[string]: Returns "1" if the argument is composed entirely of
digits (0 to 9), signs (+ or -), and the thousands and decimal separators.
Otherwise, returns "0". If the string begins with a decimal separator it
is not considered numeric unless the next character is a digit, and there
are no more decimal separators within the string. For example, ".07" is
numeric, but ".a" and ".07.01" are not.
Created using Inf-PHP v.2 (c) 2003 Yuri Prokushev
Created using Inf-HTML v.0.9b (c) 1995 Peter Childs