John Comerford wrote:
> Hi Folks,
>
> I am new to php.
>
> I want to accept a character string which I will use as a unique user
> id. I want to check the string to ensure the user has not typed
> characters that I consider to be invalid as part of a user id. I was
> thinking of doing something along the lines of:
>
> if (strpbrk($userid, '~!@#$%^&*()_+=-{}[]\\|;\':"<>?,./`') <> null) {
> blah, blah, blah......
>
> but I think that would still leave me open to control characters. I am
> thinking maybe I should loop through the string character by character
> and check it's ascii value (using ord) is within the range of a-z and A-Z ?
> Is this the best way of achieving this ? Is there a php command to do
> something similar ? I have done a few web searches and haven't come up
> with much.
you've had a couple of preg_match() examples, you might also consider
the following to php extensions as a possible means to input checking:
http://nl2.php.net/ctype
http://nl2.php.net/filter
>
> TIA,
> JC
>
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