php - How to detect spoiled or crashed images after upload -


how can detect spoiled images after upload?

im using code this:

$imagesize = getimagesize($tmp_name); if(!$imagesize || !in_array($imagesize['mime'], $allowmimetype)){ $this->error = 'bad image'; @unlink($tmp_name); return false; } $tn = imagecreatetruecolor(80, 80); switch ($imagesize['mime']){ case 'image/jpeg': $userphoto = imagecreatefromjpeg($tmp_name);// error 1 break; case 'image/png': $userphoto = imagecreatefrompng($tmp_name);// error 1 break; case 'image/gif': $userphoto = imagecreatefromgif($tmp_name);// error 1 break; case 'image/bmp': $userphoto = imagecreatefromwbmp($tmp_name);// error 1 break; default: $this->error = 'unknown image'; @unlink($tmp_name); return false; break; } imagecopyresampled($tn, $userphoto, 0, 0, 0, 0, 80, 80, $width, $height);// error 2 imagejpeg($tn,'images/userphoto/'.$this->username.'.jpg',100); chmod('images/userphoto/'.$this->username.'.jpg', 0777); @unlink($tmp_name); userprofile::updatephotobyusersid($this->username.'.jpg', $this->users_id);

but time give 2 error tandem,

  1. at lines have comment // error 1

imagecreatefromwbmp() [href='function.imagecreatefromwbmp'>function.imagecreatefromwbmp]: >'images/userphoto/4ff7db9800871.bmp' not valid wbmp file

imagecreatefromgif() [href='function.imagecreatefromgif'>function.imagecreatefromgif]: >'images/usersphoto/4fe70bb390758' not valid gif file

  1. at line of comment // error 2

    imagecopyresampled(): supplied argument not valid image resource

think occurs because file has damaged during uploading. if i'm right, how can solve problem? if not, reason?

before further processing, should check return value of getimagesize() .

if getimagesize() returns false, means has failed , wrong file, should terminate. once image passes check, can continue processing.

as why getting supplied argument not valid image resource, explaination simple: likely, image stored in $userphoto false because imagecreatefrompng() , other imagecreatefrom functions have failed, returning false.

solution: check uploaded image valid getimagesize() before continuing.

some possible reasons why uploads failing:

  • something corrupting images when written temp directory.
  • user uploading corrupted files.

regarding imagecreatefromwbmp() failing, because gd not support bmp files. need convert bmp format gd can work with. example, can use bmp2png.


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