Description:
------------
It seems that with PHP7 (and HHVM) deserializing a serialized SPLObjectStorage-Object results in an Object that can not access the properties any more. The properties seem to be there (somehow) as a "var_Dump($obj)" shows them, but methods from inside the newly created object can't access those values any more.

I've created a test-script at https://3v4l.org/LCmI2 to illustrate the case.

Am I missing something? I could not find a reference to this behaviour but I might just not have searched for the right terms...

Test script:
---------------
<?php

class A extends SplObjectStorage 
{
    protected $a = null;

    public function __construct()
    {
        $this->a = '123';
    }
    
    public function getA()
    {
        return $this->a;
    }
}

$serialized = serialize(new A());
$obj = unserialize($serialized);

$reader = function & ($object, $property) {
    $value = & \Closure::bind(function & () use ($property) {
        return $this->$property;
    }, $object, $object)->__invoke();

    return $value;
};

$test3 = & $reader($obj, 'a');

echo "Result from Getter\n";
var_dump($obj->getA());

echo "Result from Reflection\n";
var_Dump($test3);

echo "This is the deserialized Object\n";
var_Dump($obj);

Expected result:
----------------
I'd expect the same output in PHP7 as in PHP5.6