Warning: mysqli_connect(): Error while reading greeting packet. PID=21 in /var/www/html/db.php on line 8

Fatal error: Uncaught mysqli_sql_exception: MySQL server has gone away in /var/www/html/db.php:8 Stack trace: #0 /var/www/html/db.php(8): mysqli_connect('switchyard.prox...', 'root', Object(SensitiveParameterValue), 'railway', '37306') #1 /var/www/html/index.php(3): include('/var/www/html/d...') #2 {main} thrown in /var/www/html/db.php on line 8