$this PHP returns null

Just wondering why the get method returns Null

class Test
{
 
    protected $title;

    public function setTitle($ttl)
    {    
        
        $this->title = $ttl;
    }

    public function getTitle()
    {
        var_dump($this->title);  return Null ??? 
        return (string) $this->title;

    }

Calling the methods

in Controller 1

$test = new Test();
$test->setTitle('ttl');
 

get Method in Controller 2

$test->getTitle();  return Null

Solution:

If you want to use the getTitle(); in another controller, then you need to export your object from the first controller. Because that's how OOP works.
If you create in a file something like this:

$title= new Title();
$title->setTitle('tlt');

$title = new Title();
$title->getTitle('tlt');

You'll get NULL. This is because the $title from the first Controller isn't the same object with the $title from the second controller.

Try to use a function to export your object: try this in the first controller

function exports(){
$title= new Title();
$title->setTitle('tlt');
return $title
}

$title = exports();
$title->getTitle();