You have an Apache web server with PHP code. You are trying to integrate web pages with Postgresql. When browsing to a web page (.php), you are getting a 500 URL return code. Your PHP web page file is using the reserved command "pg_connect." How do you overcome this 500 URL return code error and have the web page work?
Possible solution #1: Reboot the web server.
Possible solution #2: Assuming other web pages work and the 500 URL return code only applies to a PHP file that is using pg_connect, there may be a blockage from the IP address of the client with the web browser. Another problem may be that the Postgres server is unreachable. There could be a DNS issue (the FQDN of the Postgres server is not resolving to the IP address correctly) or a key port is blocked (TCP port 5432). Try using the IP address instead of the FQDN of the Postgres server in the PHP page (e.g., for the $host value).