- var_dump: documentation ( source)
<?php
$o1 = new StdClass;
$o2 = new StdClass;
$s = new SplObjectStorage();
$s->attach($o1); // similar to $s[$o1] = NULL;
$s->attach($o2, "hello"); // similar to $s[$o2] = "hello";
$s->attach($o2, "cc");
foreach ($s as $k => $v) {
var_dump($k, $v, $s->getInfo());
}