A php problem again(my important step)

1

ok, this may be my late php problem. I’m going to finish my php work. and this is my last step.
I have a trouble with this php code, when I solve this problem my work is almost done. Please help me…

I have a problem with this code

it doesn’t work when I use( f_id doesn’t change in mysql database but others are ok.)

Code:$f_id = $_GET[‘f_id’];

mysql_query(“INSERT INTO image (u_id, f_id, title, description, ext, size) VALUES (’$user_info[u_id]’, '$f_id’, ‘$title’, ‘$descr’, ‘$ext’, ‘$file_size’)”);

but it works when :
Code:$f_id = $_GET[‘f_id’];

echo" $f_id";

why??;