Warning: mysqli_connect(): The server requested authentication method unknown to the client [caching_sha2_password] in /var/www/html/php/db.php on line 53

Warning: mysqli_connect(): (HY000/2054): The server requested authentication method unknown to the client in /var/www/html/php/db.php on line 53

Warning: mysqli_query() expects parameter 1 to be mysqli, boolean given in /var/www/html/php/db.php on line 54

Warning: mysqli_query() expects parameter 1 to be mysqli, boolean given in /var/www/html/php/db.php on line 55

Fatal error: Uncaught Error: Call to undefined function mysql_error() in /var/www/html/php/db.php:58 Stack trace: #0 /var/www/html/php/db.php(27): DB->db_connect() #1 /var/www/html/gen/header.php(18): DB->__construct() #2 /var/www/html/training/train_choice.php(3): include('/var/www/html/g...') #3 {main} thrown in /var/www/html/php/db.php on line 58