Necessary functions:

• Categories: add, edit, delete
• Add address
• Select categories, at least one obligatory, but more can be
• name, e-mail address, date of entry required fields
• mobile number is optional, but if granted, the international format required (36x01112222, x = 2,3,7)
• Browse adresses, paginated, based on the sort fields in the list
• Address edit, delete
• categories, there is a default ("uncategorised" named), not deletable. If a category is deleted, which already has addresses, the addresses are moved here.

Any best practive solution is an advantage (valid HTML/CSS, discrete Javascript, form usability, AdoDB, Smarty, other classes)

Settings: safe_mode=on, magic_quotes_gpc=off, error_reporting=E_ALL.

Any PHP version can be used.