Warning: PDO::__construct(): [2002] Connection refused (trying to connect via unix:///var/run/mysqld/mysqld.sock) in /var/www/vhosts/instrumentaldentista.es/httpdocs/classes/db/DbPDO.php on line 47

Fatal error: Uncaught Link to database cannot be established: SQLSTATE[HY000] [2002] Connection refused
  thrown in /var/www/vhosts/instrumentaldentista.es/httpdocs/classes/db/DbPDO.php on line 58