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numeric and alphanumeric

Posted on 2001-06-22
Last Modified: 2008-02-26

I looked for this in the PHP manual on PHP.net, but I don't find what I'm looking for (maybe I looked over it).

Basically, what I need is a way to identify whether or not a submitted value contains alphanumeric characters.  It would be even better if those characters could be stripped from the string.

For example, when a user fills in a form field and enters "dfdg2435", the script will return an error because only numbers are allowed.  If it could also remove the "dfdg" part, that would be very nice.

I can always search a string for characters with for instance strstr(), and then even remove the string, but that obviously is no practical solution if you've got a whole collection of ASCII (and other) characters to deal with.

Any suggestions?

Question by:IconMan7
  • 2

Accepted Solution

Richard Coffre earned 50 total points
ID: 6217985

To identify if a string is a numeric or not, you can use is_numeric().

If false you can scan the string and rebuild another one without the letters and other special characters.

Hope it helps.


Author Comment

ID: 6218094
Yup.  That works perfectly.
I'll try to figure out how to best replace the alphanumeric stuff, but it's not essential.


Expert Comment

by:Richard Coffre
ID: 6218133
You're welcome

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