Description:
------------
In PHP 7+ assign-by-ref creates a property BEFORE calling $this->getProp($name). This behavior is described in the documentations only for arrays.

You can see result in https://3v4l.org/PBZRS 

Test script:
---------------
<?php
class MagicByRef {
	private $prop = 'hello';

	private function &getProp($name)
	{
		printf(
			"%s: %s is %s\n",
			__METHOD__,
			$name,
			property_exists($this, $name) ? 'exists' : 'not exists'
		);

		return $this->prop;
	}

	public function __set($name, $value)
	{
		echo __METHOD__ , "($name, $value)\n";
	}

	public function &__get($name)
	{
		echo __METHOD__ , "($name)\n";

		$this->$name = &$this->getProp($name);

		return $this->$name;
	}
}

echo 'Assignment by reference: $this->$name = &$this->getProp($name)', ":\n";
$m = new MagicByRef;

$m->hello;

Expected result:
----------------
Assignment by reference: $this->$name = &$this->getProp($name):
MagicByRef::__get(hello)
MagicByRef::getProp: hello is not exists

Actual result:
--------------
Assignment by reference: $this->$name = &$this->getProp($name):
MagicByRef::__get(hello)
MagicByRef::getProp: hello is exists