Description:
------------
When concatenating a string with an attribute of a class, the attribute is considered to be void or something. It doesn't always run like that.

It can be fixed by doing this:

echo "Monster ".($this->monsters[0]->name)." hit something";

Reproduce code:
---------------
class Monster {
   public $name;
}

class test {
   private $monsters; 
   
   public function init() {
      for ($i=0; $i<100; $i++) {
         $this->monsters[$i] = new Monster();
         $this->monsters[$i]->name = "test";
      }
   }

   public function test() {
      echo "Monster ".$this->monsters[0]->name." hit something";
   }
}

$abc = new test();
$abc->init();
$abc->test();

Expected result:
----------------
Monster test hit something

Actual result:
--------------
Monster hit something