php - how to implement two database server? -

i have 2 database server. ex:

(1) local server:  $host = "localhost"; $user = "root"; $pass = ""; $db="edoctor_s";  (2) remote server $host = "****.****.net"; $user = "***_***"; $pass = "****"; $db="*****"; 

if remote server not found local server active. want use them 1 php config file.

use if condition , compare ip's, if it's local compare localhost ip's, 127.0.0.1 or ::1 if ipv6 else use other connection, like

<?php    if($_server['remote_addr'] == '127.0.0.1' || $_server['remote_addr'] == '::1') {        // ::1 if loopback address ipv6       //connect local    } else {       //connect server    } ?>