php限制单个IP与ip段访问的代码

分享下php实现IP访问限制的两段代码，分为限制单个IP访问与限制IP段访问两例代码，有需要的朋友参考下。

2. //加IP访问限制
   
3. if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
   
4. $userip = getenv('HTTP_CLIENT_IP');
   
5. } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
   
6. $userip = getenv('HTTP_X_FORWARDED_FOR');
   
7. } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
   
8. $userip = getenv('REMOTE_ADDR');
   
9. } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
   
10. $userip = $_SERVER['REMOTE_ADDR'];
    
11. }
    
12. $banned_ip = array (
    
13. "127.0.0.1",
    
14. "203.0.0.1",
    
15. "56.12.50.65",
    
16. "192.168.1.88"
    
17. );
    
18. if (in_array($userip,$banned_ip))
    
19. {
    
20. die ("Your IP is block to connect !");
    
21. }
    
22. echo "测试代码！测试";
    
23. ?>

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例2，IP段限制，限制IP段访问。

2. //加IP访问限制
   
3. if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
   
4. $userip = getenv('HTTP_CLIENT_IP');
   
5. } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
   
6. $userip = getenv('HTTP_X_FORWARDED_FOR');
   
7. } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
   
8. $userip = getenv('REMOTE_ADDR');
   
9. } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
   
10. $userip = $_SERVER['REMOTE_ADDR'];
    
11. }
    
12. $ban_range_low=ip2long("217.0.0.0"); //ip段上
    
13. $ban_range_up=ip2long("217.255.255.255");//ip段尾
    
14. $ip=ip2long($userip]);
    
15. if ($ip>$ban_range_low && $ip
16. {
    
17. print "Banned";
    
18. exit();
    
19. }
    
20. ?>

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