title: PHP dynamic zip file creation crashes with non-image filetypes. (wp)
body: <p>I have a function that takes uploaded files (WORDPRESS) and adds them to a (newly created) zip file.
  every new file is added to the zip (if is not yet created - the first file will create one ) and also to a comment with the list of the files.</p>
  
  <pre><code> function Ob99_generate_zip_file($meta) {
       // we always need post_id , right ?
      if( isset($_GET['post_id']) ) {
              $post_id = $_GET['post_id'];
          } elseif( isset($_POST['post_id']) ) {
              $post_id = $_POST['post_id'];
          }
          //setting some more variables.
          $file =  wp_upload_dir();// take array
          $file2 = wp_upload_dir();//debug
          $zipname = $file['path'].'file.zip'; // set zip file name
          $file = trailingslashit($file['basedir']).$meta['file'];// construct real path
  
              // Without this next condition the function dies. WHY ??
          list($orig_w, $orig_h, $orig_type) = @getimagesize($file); // not help to comment
          if (!$orig_type == IMAGETYPE_GIF || !$orig_type == IMAGETYPE_PNG|| !$orig_type == IMAGETYPE_JPEG) { 
           //why other filetypes not working ??
           return ;
          }
  
      $zip = new ZipArchive; // initiatte class
      $zip-&gt;open($zipname , ZipArchive::CREATE); // open buffer
      $new_filename = substr($file,strrpos($file,'/') + 1); //we do not need nested folders
      $zip-&gt;addFile($file,$sitename.'/'.$new_filename); // we add the file to the zip
      if (file_exists($zipname)){
      $comment = $zip-&gt;getArchiveComment();  // if the file already exist read the comment
      } 
      else { // if not - let´s give it a cool retro header
      $comment_head = '*********************************'. PHP_EOL ;
      $comment_head .= '****** &lt;&lt;&lt; FILE CONTENT &gt;&gt;&gt; *****'. PHP_EOL ;
      $comment_head .= '*********************************'. PHP_EOL ;
  
      }
      $comment = $comment_head . $comment ;// add header before comment
      $comment = $comment . PHP_EOL . PHP_EOL . $meta['file'] ; // add new file name
      $zip-&gt;setArchiveComment($comment); // and comment
      $zip-&gt;addFromString('filelist.txt', $comment); // create txt file with the same list
      $zip-&gt;close()or die('can not create zip file'.$file.print_r($meta).'---- DEBUG SEPERATOR ---- '.print_r($file2));  // FINISHED or DIE with debug
      }
  </code></pre>
  
  <p>My problem : if I try to upload any file other than an image - the function will DIE .
  I have added a condition for checking imagetype - but  I would like to know why it is crashing and how to make it work without said condition ...
  Does the zip function have any problems with PDF , doc or anyother ? is that a wordpress problem ? </p>