PHP: Error - Length parameter must be greater than 0

If you ever try to upload an empty file using fread(), php may show a nasty warning (according to your "error_reporting") about "Length parameter must be greater than 0" especially if you are parsing this as xml. So in order to handle this error from here you may do the next: 

<?php 
$file = $_FILES['file']; 
$error_text = true; // Show text or number 
define("UPLOAD_ERR_EMPTY",5); 
if($file['size'] == 0 && $file['error'] == 0){ 
$file['error'] = 5; 
} 
$upload_errors = array( 
UPLOAD_ERR_OK => "No errors.", 
UPLOAD_ERR_INI_SIZE => "Larger than upload_max_filesize.", 
UPLOAD_ERR_FORM_SIZE => "Larger than form MAX_FILE_SIZE.", 
UPLOAD_ERR_PARTIAL => "Partial upload.", 
UPLOAD_ERR_NO_FILE => "No file.", 
UPLOAD_ERR_NO_TMP_DIR => "No temporary directory.", 
UPLOAD_ERR_CANT_WRITE => "Can't write to disk.", 
UPLOAD_ERR_EXTENSION => "File upload stopped by extension.", 
UPLOAD_ERR_EMPTY => "File is empty." // add this to avoid an offset 
); 
// error: report what PHP says went wrong 
$err = ($error_text) ? $upload_errors[$file['error']] : $file['error'] ; 
header("Content-Type: text/xml"); 
echo '<errors> 
<error>'. 
$err .' 
</error> 
</errors> 
'; 
// Add your code to prevent fread() to run, either from here or with a previous "if" 
?>