Fatal error: Call to undefined function pg_connect()
You need to install the php-pgsql package or whatever it's called for your platform. Which I don't think you said by the way.
On Ubuntu and Debian:
sudo apt-get install php-pgsql
Uncaught Error: Call to undefined function pg_connect() using XAMPP on Windows
You need to enable pgsql.dll if you want to use pg_*() functions.
You enabled php_pdo_pgsql.dll which allows for connecting to PG DBs using the PDO extension.
PHP to Postgres - Fatal error: Call to undefined function pg_connect()
Well, I don't know if this is the best solution, but I updated my PHP to version 5.6 and that took care of it.
Documentation here - http://coolestguidesontheplanet.com/upgrade-php-on-osx/
Hope that is helpful.
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