zencart批量删除无图片产品

<?php   
require(‘includes/application_top.php‘);    
$listing_sql = "select * from " .TABLE_PRODUCTS. " ";   
$listing = $db->Execute($listing_sql);   
while (!$listing->EOF)
{   
    if(!file_exists("images/" . $listing->fields[‘products_image‘])) //判断图片是否存在   
    {   
        $id= $listing->fields[‘products_id‘];   
        if ($id!="")   
        {   
            //删除数据库里该产品的数据。 删除不完全，可以自己修改。   
            $p_sql = "DELETE FROM " .TABLE_PRODUCTS ." WHERE products_id = $id" ;    
            $d_sql = "DELETE FROM " .TABLE_PRODUCTS_DESCRIPTION ." WHERE products_id = $id" ;    
            $c_sql = "DELETE FROM " .TABLE_PRODUCTS_TO_CATEGORIES ." WHERE products_id = $id" ;    
            $a_sql = "DELETE FROM " .TABLE_PRODUCTS_ATTRIBUTES ." WHERE products_id = $id" ;     
            $db->Execute($p_sql);   
            $db->Execute($d_sql);   
            $db->Execute($c_sql);   
            $db->Execute($a_sql);   
            echo "DEL ID $id  Product OK"."<br />\r\n";   
        }   
    }   
    $listing->MoveNext();   
}   
?>