--TEST--
SPL: RecursiveFilterIterator
--FILE--
<?php

class MyRecursiveFilterIterator extends RecursiveFilterIterator
{
    function accept(): bool
    {
        return true;
    }
}

$ar = array(1, array(21, 22), 3);
$it = new RecursiveArrayIterator($ar);
$it = new MyRecursiveFilterIterator($it);
$it = new RecursiveIteratorIterator($it);

foreach($it as $k => $v)
{
    echo "===\n";
    var_dump($it->getDepth());
    var_dump($k);
    var_dump($v);
}

?>
--EXPECT--
===
int(0)
int(0)
int(1)
===
int(1)
int(0)
int(21)
===
int(1)
int(1)
int(22)
===
int(0)
int(2)
int(3)