how to create multiple domain session?

config.php (http://admin.abc.com/config.php)
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session_set_cookie_params(0,’/’,’.abc.com’);

session_start();

$_SESSION[‘darshak’]=’darshak’;

=======================================================

session.php (http://admin.abc.com/session.php)

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session_set_cookie_params(0,’/’,’.abc.com’);
session_start();
echo $_SESSION[‘darshak’];

===============================================================

session.php (http://www.abc.com/session.php)

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session_set_cookie_params(0,’/’,’.abc.com’);
session_start();
echo $_SESSION[‘darshak’];

===============================================================

Refer Link : http://php.net/manual/en/function.session-set-cookie-params.php