<?php

    $db_connection = pg_connect("host=localhost dbname=postgres user=postgres password=postgres");

    if ($db_connection) {

    echo 'Connection attempt succeeded.';

    } else {

    echo 'Connection attempt failed.';

    }
?>

$db_connection = pg_connect("
    host=localhost
    dbname=postgres
    user=postgres
    password=postgres
") or die('Could not connect:' . pg_last_error());