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mysql_connect(): Too many connections

Warning: mysql_connect(): Too many connections in /www/dev/vitafit.inweb.hu/libraries/DB.php on line 15
    public static function connect() {
        $dbSettings = self::$root_db;

        $connLink = mysql_connect($dbSettings['host'], $dbSettings['user'], $dbSettings['password'])
                    or Handlers::fatalerrorHandler('Nem tudok csatlakozni: ' . mysql_error());

PHP: 5.6.40-1~dotdeb+7.1, OS: Linux