thinkphp 获取客户端ip地址方法

/*** 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* @param boolean $adv 是否进行高级模式获取（有可能被伪装） * @return mixed*/
function get_client_ip($type = 0,$adv=false) {$type       =  $type ? 1 : 0;static $ip  =   NULL;if ($ip !== NULL) return $ip[$type];if($adv){if (isset($_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     =   $_SERVER['REMOTE_ADDR'];}}elseif (isset($_SERVER['REMOTE_ADDR'])) {$ip     =   $_SERVER['REMOTE_ADDR'];}// IP地址合法验证$long = sprintf("%u",ip2long($ip));$ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);return $ip[$type];
}