<?php

public function establishConnection()
{
    return "function connectToPostgres() {
        \$db= '<dbname>';
        \$user= '<user>';
        \$pwd= '<pwd>';
        \$connection = \"host=<host>  port=<port> dbname='\$db'  user='\$user' password='\$pwd'\";
        \$connect = pg_connect(\$connection);
        return \$connect;
    }";
}