How to test:
class c1 { var $t; }
class c2 { var $s; }
$v1 = new c1;
$v2 = new c2;
$v2->s = "Working!";
$v1->t[] = $v2;

print $v1; /* Object */
print $v1->t; /* Array */
print $v1->t[]; /* Object */
print $v1->t[]->s; /* Should be "Working!" but it fails! */