Online PHP editor | refs for Z3Img

<?php $a = []; $a[] = $a; echo "\na: ".serialize($a); $b = []; $b[] =& $b; echo "\nb: ".serialize($b); $c = new stdClass(); $c->c = $c; echo "\nc: ".serialize($c); $d = new stdClass(); $d->c =& $d; echo "\nd: ".serialize($d); $e = new stdClass(); $e->e = clone $e; echo "\ne: ".serialize($e);