When I started my life as a developer, the first set of trouble I ran into was to check the form once it has been submitted.Presented here is a set of functions for a full cycle of basic form checks, use them with some imagination and you will have a powerfull tool to do most of the tasks in checking and securing your form. A new function 'check_text_fields_allowed_symbols' has beed added works simmilar to 'check_text_fields' function.