PHP-嵌套foreach循环内多维数组键的字符串值

我正在尝试获取最里面数组的键的字符串值，但是，

食品和饮料

，

糖果

&

茶具或咖啡套装

只需作为

数组

返回即可

<?php

$categoryParents = array(

  'Food & Drink' => array(
      'Beverages' => array(
        'Energy & Sports Drinks',
        'Wine & Champagne'
      ),
      'Candy' => array(
        'Chewing Gum',
        'Lollipops',
        'Jelly Beans'
      ),
      'Candy Dishes',
      'Food Gifts',
      'Fruit',
      'Popcorn',
      'Pretzels',
      'Seeds',
      'Spices',
      'Tea Or Coffee Sets' => array(
        'Coffee',
        'Tea'
      ),
      'Water'
  )

);

foreach ($categoryParents as $pcat => $psubcats) {
  foreach ($psubcats as $psubcat) {
    if (is_array($psubcat) && sizeof($psubcat) > 0) {
      print_r($psubcat . " <-- parent test \n");
      foreach ($psubcat as $psub2cat) {
        print_r($psub2cat . " <-- sub \n");
      }
    } else {
      print_r($psubcat . "<-- parent \n");
    }
  }
}

?>

此脚本在我的计算机上的输出如下：

PHP Notice:  Array to string conversion in /Users/guy/Desktop/test-2.php on line 34

Notice: Array to string conversion in /Users/guy/Desktop/test-2.php on line 34
Array <-- parent test 
Energy & Sports Drinks <-- sub 
Wine & Champagne <-- sub 
PHP Notice:  Array to string conversion in /Users/guy/Desktop/test-2.php on line 34

Notice: Array to string conversion in /Users/guy/Desktop/test-2.php on line 34
Array <-- parent test 
Chewing Gum <-- sub 
Lollipops <-- sub 
Jelly Beans <-- sub 
Candy Dishes<-- parent 
Food Gifts<-- parent 
Fruit<-- parent 
Popcorn<-- parent 
Pretzels<-- parent 
Seeds<-- parent 
Spices<-- parent 
PHP Notice:  Array to string conversion in /Users/guy/Desktop/test-2.php on line 34

Notice: Array to string conversion in /Users/guy/Desktop/test-2.php on line 34
Array <-- parent test 
Coffee <-- sub 
Tea <-- sub 
Water<-- parent 

PHP注意：第34行/Users/guy/Desktop/test-2.PHP中的数组到字符串转换
注意：第34行/Users/guy/Desktop/test-2.php中的数组到字符串转换
数组写入此片段以便打印数组键

foreach ($psubcats as $k => $psubcat) {
    if (is_array($psubcat) && sizeof($psubcat) > 0) {
      print_r($k . " <-- parent test \n");

foreach（$psubcat作为$k=>$psubcat）{
如果（is_阵列（$psubcat）&sizeof（$psubcat）>0）{
印刷费（$k）。”