RecursiveArrayIterator.php

<?php

$arr = array(
	3, 4, 5,
	[5, 7, 8,
		[9, 10, 11, 12,
			[13, 14, 15],
			15, 17],
		18, 19],
	20
);


$rit = new RecursiveArrayIterator($arr);
echo "<pre>";
//var_dump($rit);
$rii = new RecursiveIteratorIterator($rit);

echo "<hr>";
echo "RecursiveArrayIterator<br>";
foreach ($rii as $key => $value) {
	$depth = $rii->getDepth();
	echo " depth = $depth, key = $key, value = $value<br>";
}
echo "<hr>";
echo "foreach<br>";
foreach ($arr as $key => $value) {
	echo "key = $key, value = $value<br>";
}