How to programmatically find public properties of a class from inside one of it's methods

function get_object_public_vars($object) {
    return get_object_vars($object);
}

(new ReflectionObject($this))->getProperties(ReflectionProperty::IS_PUBLIC);

$publicProperties = call_user_func('get_object_vars', $this);

<?php
class Foo {
    private $bar = '123';
    protected $boo = '456';
    public   $beer = 'yum';

   // return an array of public properties 
   public function getPublicVars(){
      $publicVars = create_function('$obj', 'return get_object_vars($obj);');
        return $publicVars($this);
   } 
}

 $foo = new Foo();
 $foo->tricky = 'dynamically added var';

 $result = $foo->getPublicVars();  
 print_r($result);