[devnexen]

Fix #24373

The context was destroyed while still registered. Unregister it first.

[iliaal]

Looks good to me, maybe add a test for the unserialize side too? Something like this:

class D { 
   function __destruct() { 
      $GLOBALS['r'] = unserialize('a:2:{i:0;O:8:"stdClass":0:{}i:1;r:2;}');
   } 
}
unserialize('a:2:{i:0;O:1:"D":0:{}i:0;i:1;}');
var_dump($GLOBALS['r'][0] === $GLOBALS['r'][1]);