PHP数据库语法，下面的$sql = "select * from $table where $where order by id desc "; 有错吗？

function get_zj_str($customerid,$admin_id,$table,$title_field,$divdesc) {
if($customerid){

$where .= " customerid='$customerid'";
}

if($admin_id){

$where .= " admin_id='$admin_id'";
}

if($divdesc=="dati") {
$where .= " and type=0";

}
$sql = "select * from $table where $where order by id desc ";

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