<?php
$tree = [ 1 => [11 => ["a", "b"], 12 => ["a", "b", "3"], 13 => ["1", 2 => [1,2,3,4=>[1,2,3,4]], "a"]],
				2 => [21 => [[1, 2], ["a", "b"]], 22=> [1, "a"], 23 => ["a", 2, 3], 24 => [1, 2]],
				3 => [31 => ["a", "e"], 32 => [[1,2,3],[4,5,6],[7,8,9]], 33 => [1, "a"] ]
				
		];

//print_r($tree);

function drawArraySneaky ($var) {
	if(is_array($var)) {
		echo "+++";
		foreach ($var as $name => $value) {
			echo "$name:\n";
			echo "---";
			drawArraySneaky ($value);
			echo "---";
		}
	} else {
		echo "";
		echo $var . "";
	}
	
}


drawArraySneaky($tree);