Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\program\products\addproduct.php:48) in C:\xampp\htdocs\program\products\addproduct.php on line 77 
$s=$_REQUEST;
$s=$s[subcategory];
$n=$_POST["productname"];
$p=$_POST["productprice"];
$d=$_POST["productdes"];
$i=$_POST["productimage"];

$sql="INSERT INTO products (product_name,subcat_id ,price,description,product_image) VALUES ('$n','$s','$p','$d','$i')";
//"INSERT INTO freshers_details "."VALUES "."('$name','$mobile','$qualif','$addr','$gender','$mailid')";
        if(mysql_query($sql,$con))
            {
            header('Location: http://localhost/program/products/products_listing.php');
            }
            else
            {
            die('Error: ' . mysql_error());
            }
        mysql_close($con);  
}