My Drupal site has form for adding node.
Node can be added by guest, so I need to filter field 'phone'.
Give me advice how I can add array with prohibited phones.
If completed form is sent with phone from photibited array Drupal wouldn't have to add this node.
Thank you
You could use Field Validation and use a word blacklist validation system for your phone field. If the phone field contains a prohibited number (one of the blacklist you created) the node won't be created and a proper alert will be displayed.
This module can handle many validation systems (regex, blacklist, numeric, length, whitelist...), it should suit your need.
Good luck