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PHP code to record visitor IP address

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2016-07-25 09:07:352912browse
  1. //File name
  2. $filename = "ip.txt";
  3. if (isset($_SERVER['HTTP_CLIENT_IP']))
  4. {
  5. $clientip = $_SERVER['HTTP_CLIENT_IP' ];
  6. }elseif (isset($_SERVER['HTTP_X_FORWARD_FOR']))
  7. {
  8. $clientip = $_SERVER['HTTP_X_FORWARD_FOR'];
  9. }else
  10. {
  11. $clientip = $_SERVER['REMOTE_ADDR'];
  12. }
  13. //Open the file (the file does not exist and will be created automatically)
  14. if (!$fp = fopen($filename, "a+"))
  15. {
  16. echo "Cannot open file$";
  17. exit;
  18. }
  19. //Write It also determines whether there is duplicate data
  20. while(!feof($fp))
  21. {
  22. $line = fgets($fp);
  23. if($line == ($clientip."n"))
  24. {
  25. exit; //Exit if there is duplicate data;
  26. }
  27. }
  28. //Write to file
  29. if(!fwrite($fp,$clientip."n"))
  30. {
  31. echo "Cannot write to file $filename" ;
  32. exit;
  33. }
  34. //Writing to file has been completed
  35. fclose($fp);
  36. ?>
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