Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for YOUR_DB_HOST failed: Name or service not known in /var/www/html/mysqli_connection.php on line 2

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for YOUR_DB_HOST failed: Name or service not known in /var/www/html/mysqli_connection.php:2 Stack trace: #0 /var/www/html/mysqli_connection.php(2): mysqli->__construct('YOUR_DB_HOST', 'YOUR_DB_USER', Object(SensitiveParameterValue), 'YOUR_DB_NAME', 3306) #1 /var/www/html/config.php(131): include_once('/var/www/html/m...') #2 /var/www/html/header.php(2): include_once('/var/www/html/c...') #3 /var/www/html/index.php(2): include_once('/var/www/html/h...') #4 {main} thrown in /var/www/html/mysqli_connection.php on line 2