Example form is linked to a database table, but won't be saved in this example.
When you submit the form, the value is presented with debug_dump(), so strings are quoted and array values listed.
<?php $field = new form_field_telephone($form, 'Telephone'); $field->db_field_set('telephone'); $field->format_error_set('Your telephone number does not appear to be correct.'); $field->required_error_set('Your telephone number is required.'); $field->max_length_set('Your telephone number cannot be longer than XXX characters.', 200); ?>