Can Object Of A Parent Class Access Methods / Properties Of Child Class?
@thebigk
•
Oct 22, 2024
Oct 22, 2024
1.5K
I've began dedicating time to teach myself OOP and PHP and stumbled upon a very basic problem with inheritance. While the answers to the above question is already available online; I thought it'd help many new programmers understand the basics. So here we go.
You see that I'm deliberately trying to echo object so that the toString() method is accessed from MyClass.
The problem:
The constructor and the destructor of MyClass aren't being executed as I'd expect. Would love to know why?
<?php
class MyClass
{
public $prop1 = "This is my new property in MyClass <br/>";
public function __construct()
{
echo "New Instance Of " . __CLASS__ . "has been created. <br/>";
}
public function __destruct()
{
echo "The class" . __CLASS__ . "has been destroyed. <br/>";
}
public function __toString()
{
echo "Now under toString method<br/>";
return $this-getProperty();
}
public function setProperty($newVal)
{
$this->prop1 = $newVal;
}
public function getProperty()
{
return $this->prop1 . "<br/>";
}
}
//Extending the MyClass
class MyNewClass extends MyClass
{
//Let's build a new constructor here
public function __construct()
{
echo "I'm a new constructor inside" . __CLASS__ . "I'm inside extended MyClass. <br/>";
}
//..and one more destructor in here
public function __destruct()
{
echo "I'm a destructor of " . __CLASS__ . "inside the extended MyClass. <br/>";
}
public function MyNewMethod()
{
echo "Currently Under" . __CLASS__ . "ain't that cool?<br/>";
}
}
$newobj = new MyNewClass;
echo $newobj->MyNewMethod();
echo "---------<br/>";
$oldobj = new MyClass;
echo $oldobj->; // THIS IS WHERE THE PROBLEM LIES!
?>
The problem:
The constructor and the destructor of MyClass aren't being executed as I'd expect. Would love to know why?
