How and why use curly braces: return $this->{$this->action}();

Question

so in first part i made 2 object, instantiate two classes (one we generate from createController function)

$loader = new Loader(); 
$controller = $loader->cre         


        

Answer 1

$this->{$this->action}();

means that the method that should be called comes from the property $this->action.

$this->action = 'func1';
$this->{$this->action}();

is equivalent to:

$this->func1();

See the PHP documentation of variable variables and variable functions for more examples of this. The braces are needed because $this->$this->action() would normally be treated as ($this->$this)->action().