获取IP地址

/**
 * 1,获取IP地址
 */

function ip_address() {
    if (!empty($_SERVER["HTTP_CLIENT_IP"])) {
        $ip_address = $_SERVER["HTTP_CLIENT_IP"];
    } else if (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        $ip_address = array_pop(explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']));
    } else if (!empty($_SERVER["REMOTE_ADDR"])) {
        $ip_address = $_SERVER["REMOTE_ADDR"];
    } else {
        $ip_address = '';
    }
    return $ip_address;
}