[RESOLVED] Digits only in a string

[zzz]

I need to validate an input string - it must be 9 numbers only and only numeric, no spaces or other characters.

I am able to evaluate the length of it by doing:

strlen($string) == 9

How do I valiadate against the other criteria?

[bodzan]

... [man]is_numeric[/man]

[Installer]

If you want a string of only digit characters, "ctype_digit()" will work better since "is_numeric()" allows a few other characters ("+","-", "e", "x", ".", " ").

[zzz]

After a bit more contemplation I realized I did not even need to do this any way. Later in my script I use the values to do checksum, so if someone enters other chars the sum will be incorrect and it'll get FALSE anyway.

Thanks for the tips though!