Max Value Recursive in Array PHP

MaxArray.php

<?php
function MaxArray($arr){
  $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
  // initialize $max
  $iterator->next(); 
  $max = $iterator->current();
  // "iterate" over all values
  foreach($iterator as $v) {
    if ( $v > $max ) {
      $max = $v;
    }
  }
  return $max;
}
$arr = array(array(141,151,161), 2, 3, array(101, 202, array(303,404)));
echo MaxArray($arr);