php-src/Zend/tests/gc_035.phpt

--TEST--
GC 035: Lost inner-cycles garbage
--INI--
zend.enable_gc = 1
--FILE--
<?php
class A {
	public $a;
	public $x;
	function __destruct() {
		unset($this->x);
	}
}
$a = new A;
$a->a = $a;
$a->x = [];
$a->x[] =& $a->x;
$a->x[] = $a;
var_dump(gc_collect_cycles());
unset($a);
var_dump(gc_collect_cycles());
var_dump(gc_collect_cycles());
--EXPECT--
int(0)
int(2)
int(0)