Warning: mysqli_connect(): Error while reading greeting packet. PID=3828957 in /opt/lampp/htdocs/classes/db/c_db_manager.php on line 39

Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in /opt/lampp/htdocs/classes/db/c_db_manager.php on line 39

Warning: mysqli_error() expects parameter 1 to be mysqli, bool given in /opt/lampp/htdocs/classes/db/c_db_manager.php on line 39
Error
Warning: mysqli_close() expects parameter 1 to be mysqli, bool given in /opt/lampp/htdocs/classes/db/c_db_manager.php on line 53