[PHP-INST] abot the weird file upload problems: code

[Revista Electrónica de Visión porComputador]

html form:
<form action="file-upload.php" method="post" enctype="multipart/form-data">
       <INPUT TYPE="hidden" name="MAX_FILE_SIZE" value="15000000">
       <input type="hidden" name="advisor2" value="oak">
       <input type="hidden" name="article2" value="test">
       Send these files:<br>
       <input name="userfile[]" type="file">
       <br>
       <input name="userfile[]" type="file">
       <br>
       <input type="submit" value="Send files" name="submit">
     </form>

php code:
for($i=0; $i<2; $i++){
  if ($userfile_name[$i]){
      if (is_uploaded_file($userfile[$i])) {
          copy($userfile[$i], "./$userfile_name[$i]");
          if(!$entrega){ $entrega = 1; }
      } else {
          echo "Possible file upload attack: filename 
'$userfile_name[$i]'.";
      }
  }
}

any ideas? Please, I'm very new in PHP so I need a LOT of constructive 
criticism

Jordi


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