php - mysqli::__construct(): MySQL server has gone away -

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i can't connect server. here mistakes gives me:

warning: mysqli::__construct(): mysql server has gone away in c:\xampp\htdocs\www\php-project\logic\db_connection.php on line 3

warning: mysqli::__construct(): error while reading greeting packet. pid=8632 in c:\xampp\htdocs\www\php-project\logic\db_connection.php on line 3

warning: mysqli::__construct(): (hy000/2006): mysql server has gone away in c:\xampp\htdocs\www\php-project\logic\db_connection.php on line 3

fatal error: maximum execution time of 30 seconds exceeded in c:\xampp\htdocs\www\php-project\logic\db_connection.php on line 3

this connection file: 

define("host", "localhost:81"); define("db_user", "root"); define("db_password", ""); define("db_name", "bulitfactory_person_cv");  $db_connection = new mysqli(host, db_user, db_password, db_name);  if ($db_connection->connect_error) {     die("connection failed. ".$db_connection->connect_error); }

please, me!

try increase max_allowed_packet , restart server





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