Description:
------------
I use PHP 7.0.4

When I run the script represented below I get the different result for versions 5.6.* and 7.0. If it is not a bug I would want to know what changes were made in PHP that may cause that different behavior. 

Test script:
---------------
class Test
{
    private $props = ['a' => 'text', 'b' => 1];

    public function &__get($prop)
    {
        return $this->props[$prop];
    }
    
    public function __set($prop, $value)
    {
        if ($prop === 'b') $value = [$value];
        $this->props[$prop] = $value;
    }
    
    public function getProperties()
    {
        return [$this->props];
    }
}

$obj = new Test;
$obj->b = $obj->b;
print_r($obj->getProperties());

Expected result:
----------------
Array
(
    [0] => Array
        (
            [a] => text
            [b] => Array
                (
                    [0] => 1
                )
        )
)

Actual result:
--------------
Array
(
    [0] => Array
        (
            [a] => text
            [b] => Array
 *RECURSION*
        )
)