$ff_ddd=$db->query("select description,product_id from oc_product_description");
$ff_dddc=$db->query("select count(product_id) from oc_product_description");
$ff_dddcou=($ff_dddc->row['count(product_id)'])-1;
while($ff_dddcou>=0)
{

$des_ff=preg_replace('/<meta(.+?)>/','',$ff_ddd->rows[$ff_dddcou]['description']);
$des_ffid=$ff_ddd->rows[$ff_dddcou]['product_id'];
$dddcex="update oc_product_description set description='".str_replace("'","\'",$des_ff)."' where product_id=".$des_ffid.";";
$db->query($dddcex);
--$ff_dddcou;
}

谁能帮我介绍一下这里面每句的意思呢，谢谢大家了