Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for ${DB_HOST} failed: Name or service not known in /var/www/html/quotesearch/index.php on line 19

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for ${DB_HOST} failed: Name or service not known in /var/www/html/quotesearch/index.php:19 Stack trace: #0 /var/www/html/quotesearch/index.php(19): mysqli->__construct() #1 {main} thrown in /var/www/html/quotesearch/index.php on line 19