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Extending Object-Oriented PHP

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Extending a Child

6:12 with Alena Holligan

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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    For our ListingFeatured class, we're going to add a code of conduct. 0:00
    The code of conduct is going to work much like the description. 0:04
    So let's copy the code from the ListingPremium and modify that. 0:07
    We don't need to change the allowed tags. 0:21
    We'll let the ListingPremium handle that, so let's remove that line. 0:23
    Now we can change description to code of conduct, or coc for short. 0:31
    We update the set values, getCoc, 0:50
    And setCoc. 1:05
    Let's update our collection to use this new listing. 1:12
    Once again we'll modify our addListing method to use this new class. 1:17
    Now let's update the statuses. 1:32
    We want our featured listings to show up first. 1:36
    So let's add it first to this list. 1:39
    Next, let's update our form. 1:44
    Once again we can copy the code from the description and make a few minor changes. 1:48
    Coc, coc, coc, Featured. 2:02
    GetCoc. 2:13
    We'll call this Code of Conduct. 2:18
    And say Featured Only. 2:23
    Finally, we need to update our listing. 2:25
    We'll start by adding another case to our switch statement. 2:31
    If featured, Then we'll use panel-success, 2:36
    And break, now, let's show the code of conduct. 2:48
    We'll make this a footer. 2:52
    If (is_a($listing, 2:57
    'ListingFeatured'). 3:02
    && !empty 3:12
    ($listing->getCoc())) 3:16
    div class="panel-footer" 3:31
    id="coc 3:39
    $listing->getId() 3:47
    Let's preview this in the browser and upgrade one of our listings. 4:06
    It looks good, but instead of having this displayed all the time, 4:26
    let's add a toggle link. 4:29
    We'll copy that, and we'll put our link here. 4:38
    Onclick="toggle(\'coc'. 4:56
    $listing->getID() 5:06
    Code of Conduct. 5:19
    Let's set the style to start as a display:none. 5:33
    Let's clean up the text from our homepage too. 5:45
    And we can preview once more. 5:54
    Great job, we have featured listings, 6:04
    premium listings, basic and inactive. 6:08

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