Reply To: PHP Session

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If the two domains share a common parent (that you control), then you can configure the session cookie to apply to all your subdomains:

<?php

// these are simply the default values;
// we have to include them in order to set the $domain argument
$ttl = 0;
$path = '/';

// note the leading dot (.) in the domain
$domain = ".rathorint.com";

session_set_cookie_params( $ttl,$path,$domain );
session_start();