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Extending Object-Oriented PHP

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A Second Child

3:18 with Alena Holligan

In this video, we will create a second child while we look at more ways to override methods.

Siblings

We cannot call a private property of a parent directly. We have to make sure we call the parent getter when overriding a method in a child or we may hit an infinite loop.

public function getTitle()
{
    return '<strike>' . parent::getTitle() . '</strike>';
}

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    We have our second child, ListingInactive. 0:00
    For this class we're going to rewrite the get method so 0:03
    that the only data we return is the title and status. 0:07
    We also want to update the status like we did for ListingPremium, so 0:11
    let's start there. 0:15
    Protected $status = 'inactive', 0:21
    now we're ready to override our getters, 0:26
    public function getWebsite(), and 0:32
    we're just going to return nothing. 0:38
    We'll do the same thing for email and Twitter. 0:46
    For the title, 1:01
    instead of just returning the title, let's return the title with a strikethrough. 1:02
    We can't access the title directly, and since we're rewriting getTitle, 1:26
    if we try to call this getTitle we'll hit an infinite loop. 1:32
    We could change the visibility of the property, but 1:37
    that's not really what we want to do. 1:39
    Instead, we'll call the parent method just like we did 1:41
    when we extended the set values. 1:44
    GetTitle, now we need our collection to use 1:50
    this new class, open classes, Collection. 1:55
    We've already been using the inactive status just not given it its own class, so 2:01
    we don't need to update the statuses. 2:06
    The ad listing method determines which listing class we use. 2:08
    Let's add another conditional. 2:17
    If the status is inactive, 2:27
    then we use the inactive class. 2:33
    Let's preview this in the browser. 2:40
    If we choose Inactive we now see that our title is crossed out and 2:43
    we don't have any other details, but let's update the display. 2:49
    Case inactive. 2:59
    Great. 3:15

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