refactoring

Good day
my be use self::$counter++; in
public function query( $query )
{
$full_query = $this->link->query( $query );
if( $this->link->error )
{
$this->log_db_errors( $this->link->error, $query );
return false;
}
else
{
self::$counter++;
return true;
}
}
and delete from all function self::$counter++;