<?php
$appName = $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$connStr = "host=187.108.198.120 port=5432 dbname=postgres user=postgres password=Pqalo987 '";

//simple check

$conn = pg_connect($connStr);
$result = pg_query($conn, "select * from pg_stat_activity");
var_dump(pg_fetch_all($result));
  //return pg_connect("...") or die('falha conexão'); acho que as 3 linhas a cima faz a mesma função
?>