Check if number is decimal

Question

I need to check in PHP if user entered a decimal number (US way, with decimal point: X.XXX)

Any reliable way to do this?

Answer 1

The function you posted is just not PHP.

Have a look at is_float [docs].

Edit: I missed the "user entered value" part. In this case you can actually use a regular expression:

^\d+\.\d+$