How to print list using hierarchical data structure?

Question

When I run this code:

foreach ($tree as $node) {
    echo str_repeat(\' \', $node->tree_depth * 4) . $node->id . PHP_EOL;
}

I get well fo

Answer 1

Try this code instead:

\n";

$tree = array(
    array('Food', 0),
    array('Fruit', 1),
    array('Red', 5),
    array('Cherry', 3),
    array('Strawberry', 3),
    array('Cool', 4),
    array('Not cool', 4),
    array('Yellow', 2),
    array('Banana', 3),
    array('Meat', 0),
    array('Beef', 4),
    array('Pork', 2),
);

$depth = 0;

foreach ($tree as $node) {
  if ($node[1] > $depth)
    echo str_repeat("
\n", $node[1] - $depth);
  if ($node[1] < $depth)
    echo str_repeat("
\n", $depth - $node[1]);
  $depth = $node[1];

  echo "
" .  $node[0] . "\n";
}
echo str_repeat("