There was a following problem.
For the client in the profile in the field "Address 1" it is entered "Sättarevägen", all data is stored in the database in UTF-8 (utf8_general_ci).
Was written module for domain registrar. When called function of registration of the domain template_RegisterDomain() function receives the array of parametres $params is called, but thus all UTF-8 characters in this array "broken". As a result, the element of the array $params['address1'] there will be data "SA�ttarevA�gen", instead of necessary "Sättarevägen".
Whether it is possible as that to correct, what in the array $params would be correct UTF-8 characters?