Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/html/mailer/index.php:1) in /var/www/html/mailer/db_connect.php on line 2

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/html/mailer/index.php:1) in /var/www/html/mailer/db_connect.php on line 2

Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo failed: Name does not resolve in /var/www/html/mailer/db_connect.php on line 20

Warning: mysqli::__construct(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name does not resolve in /var/www/html/mailer/db_connect.php on line 20
Mysql Error! Error -> php_network_getaddresses: getaddrinfo failed: Name does not resolve