php ip获取与判断IP分段类

php ip获取与判断ip分段类

class Ip {

php获取ip与ip所在城市的类

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 /**
  * 取IP
  * @return string
  */
 public static function get() {
  if ($_SERVER['HTTP_CLIENT_IP'] && $_SERVER

['HTTP_CLIENT_IP']!='unknown') {
   $ip = $_SERVER['HTTP_CLIENT_IP'];
  } elseif ($_SERVER['HTTP_X_FORWARDED_FOR'] && $_SERVER

['HTTP_X_FORWARDED_FOR']!='unknown') {
   $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
  } else {
   $ip = $_SERVER['REMOTE_ADDR'];
  }
  return $ip;
 }
 
 /**
  * IP转成整形数值
  * @param string $ip IP
  * @return int
  */
 public static function ipToInt($ip) {
  $ips = explode('.',$ip);
  if (count($ips)>=4) {
   $int = $ips[0]*256*256*256+$ips[1]*256*256+$ips[2]

*256+$ips[3];//根据IP,a,b,c类进行计算
  } else {
   throw new Exception('ip is error');
  }
  return $int;
 }
 
 /**
  * 判断IP是否在一个IP段内
  * @param string $startIp 开始IP
  * @param string $endIp 结束IP
  * @param string $ip IP
  * @return bool
  */
 public static function isIn($startIp, $endIp, $ip) {
  $start = Ip::ipToInt($startIp);
  $end = Ip::ipToInt($endIp);
  $ipInt = Ip::ipToInt($ip);
  $result = false;
  if ($ipInt>=$start && $ipInt    $result = true;
  }
  return $result;
 }
}