PHP print_r without circular issues and limited by depth

printrr.php

<?php


/**
 * Function to dump variables limited by depth and without circular issues.
 * 
 * @param $thing The object.
 * @param int $maxdepth Maximum depth to recurse.
 * @param array $stack Stack to store the previous object. Ignore this.
 * @param int $depth The current depth. Ignore this.
 */
function print_rr($thing, $maxdepth = 3, $stack = [], $depth = 0) {
  $type = 'array';
  if (is_object($thing)) {
    $vars = get_object_vars($thing);
    $type = get_class($thing);
  } else {
    $vars = $thing;
  }

  $prefix = str_repeat("  ", $depth);

  if (is_array($vars)) {
    $stack[] = $thing;
    $count = $type === 'array' ? '(' . count($vars) . ')' : '';
    if ($depth <= $maxdepth) {
      echo "$type$count => [";

      if (count($vars) == 0) {
        echo "]\n";
      }
      else {
        foreach ($thing as $k => $v) {
          if (!empty($stack) && in_array($v, $stack)) {
            echo "\n$prefix  $k => [circular]\n";
          } else {
            echo "\n$prefix  $k => ";
            print_rr($v, $maxdepth, $stack, $depth + 1);
          }
        }
        echo "$prefix]\n";
      }
    } else {
      echo "$type$count => [omitted]";
    }
    return;
  }

  var_dump($thing) . "\n";
}