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In this video we will extend the child class from ListingPremium. This new grandchild will inherit all the attributes and abilities of ListingPremium AND ListingBasic.
$object = new ListingFeatured();
//parent
echo is_a($object, 'ListingPremium'); //returns true
//grandparent
echo is_a($object, 'ListingBasic'); //returns true
//sibling of parent
echo is_a($object, 'ListingInactive'); //returns false
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