Lazy initialization

[kiboke]

I have this class:

PHP Code:

class App
{
    
    static public $obj;
    
    public function obj()
    {
        if (!isset(self::$obj))
            self::$obj = new Obj();
        
        return self::$obj;
    }
    
} 


Is this kind of lazy initialization more resourse/memory demanding because of returning the object with every request?

In other words, does the App:bj() takes more memory than direct approach with App::$obj

Thanks for any advice!