--TEST-- SPL: SplObjectStorage serialization references --SKIPIF-- --FILE-- attach($o1, array('prev' => 2, 'next' => $o2)); $s->attach($o2, array('prev' => $o1)); $ss = serialize($s); unset($s,$o1,$o2); echo $ss."\n"; var_dump(unserialize($ss)); ?> ===DONE=== --EXPECTF-- C:16:"SplObjectStorage":113:{x:i:2;O:8:"stdClass":0:{},a:2:{s:4:"prev";i:2;s:4:"next";O:8:"stdClass":0:{}};r:6;,a:1:{s:4:"prev";r:3;};m:a:0:{}} object(SplObjectStorage)#2 (1) { ["storage":"SplObjectStorage":private]=> array(2) { ["%s"]=> array(2) { ["obj"]=> object(stdClass)#1 (0) { } ["inf"]=> array(2) { ["prev"]=> int(2) ["next"]=> object(stdClass)#3 (0) { } } } ["%s"]=> array(2) { ["obj"]=> object(stdClass)#3 (0) { } ["inf"]=> array(1) { ["prev"]=> object(stdClass)#1 (0) { } } } } } ===DONE===