问添加到最深数组子元素

EN

function add_children(&$item, $key)
{
    //Here you can change item to something else (since we use &)
    $item = array('aaaa', 'bbbb', 'cccc');
}

array_walk_recursive($array, 'add_children');

<?php
$testArray = array(
  'a' => array(
    'aa' => array(
      'aaa',
      'bbb'
    )
  )
);

print_r(modifyArray($testArray));

function modifyArray($array)
{
  foreach ($array as $key => $value) {
    if (is_array($value)) {
      $array[$key] = modifyArray($value);
    } else {
      $array[$value] = $value . substr($value, 0, 1);
      unset($array[$key]);
    }
  }

  return $array;
}