Question

这是下面另一个问题的后续问题;

Removing selected elements from array of associative arrays

这次，我想从一组关联数组中过滤掉所选元素，而不是删除它们。

我有这个数组;

$result = array(
    (int) 0 => array(
        'name' => 'Luke',
        'id_number' => '1111',
        'address' => '1544addr',
        'time_here' => '2014-04-12 13:07:08'
    ),
    (int) 1 => array(
        'name' => 'Sam',
        'id_number' => '2222',
        'address' => '1584addr',
        'time_here' => '2014-04-12 14:15:26'

我想过滤此数组中的所选元素，使其看起来像这样;

array(
    (int) 0 => array(
        'name' => 'Luke',
        'id_number' => '1111'
    ),
    (int) 1 => array(
        'name' => 'Sam',
        'id_number' => '2222'

为了删除元素，函数unset派上用场。但是，如果我想过滤所选元素呢？代码怎么样？

谢谢。

Answer 1

试试这个

   // $result is your input array
    $arr_filter_keys = array("name", "id_number"); // array of keys to be filter
    $arr_filter_result = array();  // output array
    foreach($result as $key=>$arr)
    {
       foreach($arr_filter_keys as $filter_key)
       {
          $arr_filter_result[$key][$filter_key] = $arr[$filter_key];
       }
    }

    print_r($arr_filter_result); // output array

Demo-1

更新2：

如果你想得到相同的数组

   // $result is your input array
    $arr_filter_keys = array("name", "id_number"); // array of keys to be filter

    foreach($result as $key=>$arr)
    {
       foreach($arr as $k=>$v)
       {
         if(!in_array($k, $arr_filter_keys))
         {
            unset($result[$key][$k]);
         } 
       }
    }

    print_r($result); // output array

<强> Demo-2

Answer 2

你可以使用它;

function filterArr(&$arr, $keys_to_be_filtered) {
    foreach($arr as $key => $value) 
    { 
        foreach($keys_to_be_filtered as $key_to_remove) {
            unset($arr[$key][$key_to_remove] ); 
        }
    }   
}

filterArr($result, array("address", "time_here"));

以下是一个有效的演示： Demo

Answer 3

在unset将它们保存在另一个数组之前。

$filtered = array();
foreach($arr as $key=>$val){
  $filtered[$key]['address'] = $val['address'];
  $filtered[$key]['time_here'] = $val['time_here'];
  unset($arr[$key]['address'],$arr[$key]['time_here']);
}

<强> Demo

从关联数组数组中过滤选定的元素

3 个答案: