PHP 获取ip地址

 
function getip() {
    static $ip = '';
    $ip = $_SERVER['REMOTE_ADDR'];
    if(isset($_SERVER['HTTP_CDN_SRC_IP'])) {
        $ip = $_SERVER['HTTP_CDN_SRC_IP'];
    } elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}\\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
        foreach ($matches[0] AS $xip) {
            if (!preg_match('#^(10|172\\.16|192\\.168)\\.#', $xip)) {
                $ip = $xip;
                break;
            }
        }
    }
    return $ip;
}