PHP cURL fails to fetch images from website - php

Question

I've written a small PHP script for grabbing images with curl and saving them locally.
It reads the urls for the images from my db, grabs it and saves the file to a folder.
Tested and works on a couple other websites before, fails with a new one I'm trying it with.
I did some reading around, modified the script a bit but still nothing.
Please suggest what to look out for.
$query_products = "SELECT * from product";
$products = mysql_query($query_products, $connection) or die(mysql_error());
$row_products = mysql_fetch_assoc($products);
$totalRows_products = mysql_num_rows($products);
do {
$ch = curl_init ($row_products['picture']);
$agent= 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)';
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20110319 Firefox/4.0');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
$rawdata = curl_exec ($ch);
$http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close ($ch);
if($http_status==200){
$fp = fopen("images/products/".$row_products['productcode'].".jpg", 'w');
fwrite($fp, $rawdata);
fclose($fp);
echo ' -- Downloaded '.$newname.' to local: '.$newname.'';
} else {
echo ' -- Failed to download '.$row_products['picture'].'';
}
usleep(500);
} while ($row_products = mysql_fetch_assoc($products));

Answer 1

Your target website may require/check a combination of things. In order:
Location. Some websites only allow the referer to be a certain value (either their site or no referer, to prevent hotlinking)
Incorrect URL
Cookies. Yes, this can be checked
Authentication of some sort
The only way to do this is to sniff what a normal request looks like and to mimic it. Your MSIE user-agent string looks different from a genuine MSIE UA, however, and I'd consider changing it to an exact copy of a real one if I were you.
Could you get curl to output to a file (using the setopt for output stream) and telling us what error code you are getting, along with the URL of an image? This will help me be more precise.
Also, 0 isn't a success - it's a failure