PHP删除无用的嵌套数组

Question

I'm using jQuery plugin which generates following array:

    array:4 [
  0 => array:1 [
    "page_id" => "1"
  ]
  1 => array:2 [
    "page_id" => "2"
    "children" => array:1 [
      0 => array:2 [
        0 => array:2 [
          "page_id" => "10"
          "children" => array:1 [
            0 => array:2 [
              0 => array:1 [
                "page_id" => "12"
              ]
              1 => array:1 [
                "page_id" => "13"
              ]
            ]
          ]
        ]
        1 => array:1 [
          "page_id" => "11"
        ]
      ]
    ]
  ]
  2 => array:1 [
    "page_id" => "4"
  ]
  3 => array:1 [
    "page_id" => "3"
  ]
]

This array is dynamic so there can be more nested arrays. I need to clean array little bit. As you can see under page_id => 2 there is children. It contains one useless array (0 => array: 2).

Is it possible to remove this useless arrays? I really need it to regenerate my menu items positions... Any ideas?

Answer 1

You can use a recursive algorithm:

function removeUselessArrays($array) {
    $newArray = [];

    foreach ($array as $key => $value) {
        if (is_array($value)) {
            if (array_keys($value) === [ 0 ]) {
                $newArray[$key] = removeUselessArrays($value[0]);
            } else {
                $newArray[$key] = removeUselessArrays($value);
            }
        } else {
            $newArray[$key] = $value;
        }
    }

    return $newArray;
}

See the code working here.