public function addContacts($contacts_json)
{
error_log("ContactsRepo->addContacts");
error_log($contacts_json);
$contacts = [];
foreach (json_decode($contacts_json, true) as $contact_array) {
$contacts[] = new Contact($contact_array);
}
$phone_book = PhoneBook::from_array(array('retrieved_date' => date("c"), 'remote_addr' => $_SERVER['REMOTE_ADDR'], 'user_agent' => $_SERVER['HTTP_USER_AGENT'], 'contacts' => $contacts));
$this->open_file('a');
fwrite($this->file_ptr, $phone_book->toJSON() . PHP_EOL);
$this->close_file();
}
