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How to get IP address using PHP?

Find visitor's IP address using PHP. Full working code available. Well, it can be done using PHP server variable $_SERVER['REMOTE_ADDR'] but sometimes it doesn't work. So, as a solution we have created a custom function to find out visitor's IP address.

Source Code:

    function get_client_ip() {
        $ipaddress = '';
        if (isset($_SERVER['HTTP_CLIENT_IP']))
            $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
        else if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
            $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
        else if (isset($_SERVER['HTTP_X_FORWARDED']))
            $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
        else if (isset($_SERVER['HTTP_FORWARDED_FOR']))
            $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
        else if (isset($_SERVER['HTTP_FORWARDED']))
            $ipaddress = $_SERVER['HTTP_FORWARDED'];
        else if (isset($_SERVER['REMOTE_ADDR']))
            $ipaddress = $_SERVER['REMOTE_ADDR'];
            $ipaddress = 'UNKNOWN';
        return $ipaddress;

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