after changing url in wp admin to https got into indirect loop to solve that i defined wp-config urls and now server error

this is the log files of nginx FastCGI sent in stderr: PHP message: PHP Parse error: syntax error, unexpected :, expecting , or ) in /var/www/html/ wp-config.php on line 20 while reading response header from upstream, client: 172. 68.146.45, server: _, request: GET / HTTP/1.1, upstream: fastcgi://unix:/var/run /php/php7.0-fpm.sock