PHP获取客户端IP的函数

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       /**
       
       
 * 获取客户端IP地址
       
       
 * @param integer $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
       
       
 * @return mixed
       
       
 */
       
       
function get_client_ip($type = 0) {
       
       
    $type       =  $type ? 1 : 0;
       
       
    static $ip  =   NULL;
       
       
    if ($ip !== NULL) return $ip[$type];
       
       
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
       
       
        $arr    =   explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
       
       
        $pos    =   array_search('unknown',$arr);
       
       
        if(false !== $pos) unset($arr[$pos]);
       
       
        $ip     =   trim($arr[0]);
       
       
    }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
       
       
        $ip     =   $_SERVER['HTTP_CLIENT_IP'];
       
       
    }elseif (isset($_SERVER['REMOTE_ADDR'])) {
       
       
        $ip     =   $_SERVER['REMOTE_ADDR'];
       
       
    }
       
       
    // IP地址合法验证
       
       
    $long = ip2long($ip);
       
       
    $ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);
       
       
    return $ip[$type];
       
       
}
      
      
      
      

       
       
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