Question

I want to check if the variable $username is alphanumeric and less than 15 characters. Does CodeIgniter have this functionality built in? I don’t want to rewrite these functions if they already exist. I know there’s form validation, but that’s not what I want.

Answer 1

Following @Sparky’s comment, all the validation functions look like they are public functions inside of Form_validation.php

you can load form vlaidation and use the validation functions directly

so you could run it through max_length then alpha_numeric, as they are all public just look at source and call them with the correct params