CODEWITHSUNDEEP
phpoopinheritanceabstract-class
Darius
Darius

Reputation: 612

Inheriting properties from a parent object

All,

If I have a class like so:

class MyClass {
     var $height;
     var $width;

     function setDimensions($height,$width) {
        $this->height = $height;
        $this->width  = $width;
     }
}

And another class like so...

class AnotherClass extends MyClass {
     var $color;
     var $speed;

     function setFeatures($color,$speed) {
        $this->color  = $color;
        $this->speed  = $speed;
     }

     function showAll() {
        echo "Color: ".$this->color."<br />";
        echo "Speed: ".$this->speed."<br />";
        echo "Height: ".$this->height."<br />";
        echo "Width: ".$this->width."<br />";
     // echo "Height: ".parent::height."<br />";
     }
}

Then I do this:

$firstClass = new MyClass();
$firstClass->setDimensions('200cm', '120cm');

$secondClass = new AnotherClass();
$secondClass->setFeatures('red','100mph');

$secondClass->showAll();

It does not print the properties defines in the $firstClass. This is understandable as they are two separate instances/objects. How can I pass the properties from one object to another? Would I need to do something like $secondClass = new AnotherClass($firstClass) and pass it that way?

Thank you in advance, any help is appreciated.

Upvotes: 0

Views: 32

Answers (1)

Bogdan Burym
Bogdan Burym

Reputation: 5512

Because they are different instances.

In this example there is one instance which is being both AnotherClass and MyClass at the same time

$firstClass = new AnotherClass();
$firstClass->setDimensions('200cm', '120cm');
$firstClass->setFeatures('red','100mph');

$firstClass->showAll();

None of this classes is abstract.

In your example, the following statements are true:

  • $secondClass is a AnotherClass
  • $secondClass is a MyClass
  • $firstClass is a MyClass
  • $firstClass is not a AnotherClass

Also, please do not use var to define classes properties.

Use either private, public or protected:

class MyClass {
     public $height;
     public $width;

Upvotes: 2

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