[JQuery] 如何得到使用者的真實ip

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<?php

if (!empty($_SERVER['HTTP_CLIENT_IP']))

    $ip=$_SERVER['HTTP_CLIENT_IP'];

else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))

    $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];

else

    $ip=$_SERVER['REMOTE_ADDR'];

?>