Fatal error: Call to undefined function pg_Connect()

i ve Ubuntu 16.04 with php7, apache2, PostgreSQL v9.5 VPS at digitalocean and
im tryig to read data form Odoo 8 PostgreSQL. im lack of knowledge and
trying to learn.

here is the code which is in my 2nd hosting server php
http://pastebin.com/R3bwfXtR

but im getting Call to undefined function pgConnect() in
/home/f****/publichtml/***.****.net/new.php on line 11

php -i result:
http://pastebin.com/5z6G73Tw

i tried like every possible solutions but no luck. DigitalOcean support team
couldnt solve it in 4 days and now im open to all solutions.
i can give u server access if you are reliable.

Sorry for my bad english.
Please help



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