[php] upload pliku MySQL Opcje

[mmmincberg]

skrypt upload.php :

[PHP] pobierz, plaintext 
<?php 
mysql_connect("xxxx","xxx","xxx"); 
mysql_select_db("xxx"); 
$data = addslashes(fread(fopen($form_data, "r"), filesize($form_data))); 
$result=MYSQL_QUERY("INSERT INTO uploads (description, data,filename,filesize,filetype) ". "VALUES ('$form_description','$data','$form_data_name','$form_data_size','$form_data_type')"); 
$id= mysql_insert_id(); 
print "<p>File ID: <b>$id</b><br>"; 
print "<p>File Name: <b>$form_data_name</b><br>"; 
print "<p>File Size: <b>$form_data_size</b><br>"; 
print "<p>File Type: <b>$form_data_type</b><p>"; 
print "To upload another file <a href=http://www.yoursite.com/yourpage.html> Click Here</a>"; 
 
?> 
 
[PHP] pobierz, plaintext 

wyrzuca bład :

Warning: fread(): supplied argument is not a valid stream resource in /upload.php on line 4

co moze byc przyczyna?