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Several ways to determine the file type of uploaded files in PHP

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Release: 2016-07-25 09:04:35
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  1. /**

  2. desc: Determine the uploaded file type
  3. link: bbs.it-home.org
  4. date: 2013/2/24
  5. */
  6. $array = array('jpg','gif','png','jpeg');
  7. $picImg = '/upfile/upload_pic/thumbnail_1258615556.jpg';

  8. $img = strtolower($picImg);

  9. //Method 1 to get the file extension

  10. $ext = substr($img,strrpos($img,'.')+1);//Here is the code to read the file extension

  11. //How to get the file extension 2

  12. $ext = end(explode('.',$img));

  13. //Method 3 of getting the file extension This should be the safest, use php $ _FILES['type']

  14. $ext = $_FILES['file']['type'];

  15. //Method 4 to get the file extension

  16. $ext = getimagesize($img );//This function returns an array

  17. if( !in_array( $ext,$array ) )

  18. {
  19. exit('The thumbnail address is wrong, please re-upload!');
  20. }
  21. else
  22. {
  23. echo('The file type you uploaded is not allowed');
  24. exit;
  25. }

  26. /*

  27. strtolower Convert uppercase characters to lowercase
  28. substr character interception, right Chinese processing is not friendly.
  29. strrpos Determine the position where characters appear in the specified string
  30. explode split function, return the result as an array
  31. end Read the last value of the data
  32. $_FILES Global variable file upload
  33. getimagesize Get the type of image
  34. in_array Determine whether the variable is in the array Medium
  35. exit terminates the current script running
  36. */
  37. ?>

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