Surely you should only foreach() if you're working with a hash/map? Would a classic for($c=0, $l=count($arr); $c<$l; $c++) suffer from any similarly-exploitable

Surely you should only foreach() if you're working with a hash/map? Would a classic for($c=0, $l=count($arr); $c<$l; $c++) suffer from any similarly-exploitable problem?