The one problem with all your musings is that there is no such thing as an
integer when it comes to transferring data over http.  Everything comes as
a string.  What is done with these strings when they get to the
application is what matters.  It's not like there is an HTML form element
like <input type=integer> or <input type=float>.  All you have is <input
type=text> when it comes to users entering data and passing it to you.  I
fail to see how strong typing helps you here at all.  You are going to
have to apply some sort of user-space rule once you receive the data.  And
that is quite easy to do with PHP.

For your specific example you simply want to use the is_numeric()
function.  That will tell you definitively whether the data that came from
the user is nothing but a numeric entity.


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