Re: using CRYPT but restrict alpha-numeric

On 08.12.2021 at 00:11, gordonisnz@gmail.com wrote: > I'm looking at the various CRYPT / one-way encryption commands and i > was wondering if there is a way to create a crypt but restrict output > to alpha-numeric (a to z, A to Z and 0-9) without the special > characters ? > > Basically ive got a starting reference - numeric over 10,000,000 and > other numbers and want to do a crypt (or something) but exclude > special characters from the crypt result. > > The best I can think of is to do a crypt (or whatever) etc and then do > a preg_replace to remove the special characters etc.. > > The result will be shorter (length), but will be an alpha-numeric crypt. Yep, it would be shorter, but doing it would be a bad idea. Instead, *map* the cryptographic value to the desired value. In your case, bin2hex() would do, but a (variant of) base64_encode() might be acceptable as well, and could save memory/bandwidth. I also suggest to read up on that "crypt" thing. :) -- Christoph M. Becker