1. Can i make custom PHP validation of a field i have created?
2. Is there a Seblod/Joomla API for it? Where can i find information about it?
3. Can i avoid putting PHP validation files into Joomla directiories? Even it is not secure practice can i put PHP validation code into Mysql database?
4. Can i process/change a field params via php before it is displayed on the website?. For example i would like to remove some checkbox inputs of the same group when conditions are met.