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<?php class ParentItem { } class ChildItem extends ParentItem { } class ParentManager { function do_something(ParentItem $item) { } } class ChildManager extends ParentManager { // this is the problem. how do i explain to php that // ChildItem *is* a ParentItem function do_something(ParentItem $item) { } } (new ChildManager())->do_something(new ChildItem);
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