Problem on submitting marks

[CMAK]

With the function:

!eregi("[[:digit:]]",$STRING)

I can detect wherever the string submitted contains an English character or not.
But if I input "+10", the php doesn't show any error!
How can I solve this problem? Thanks a lot!

[LordShryku]

That eregi just looks if a digit is somewhere in the string. Look at the character type functions

[CMAK]

Great!
It works now by using !ctype_digit($string)
Thanks a lot!🙂