打破一个阵列中的两个不同的阵列在PHP

Question

我的问题是，我想基于起始时间我的阵列看起来像这样

Array 
(
    [0] => Array 
     (
      [day_of_weeks] => Monday 
      [start_time] => 6:00 PM 
      [end_time] => 7:00 PM 
     ) 

    [1] => Array 
     (
      [day_of_weeks] => Tuesday 
      [start_time] => 6:00 PM 
      [end_time] => 7:00 PM 
     ) 

    [2] => Array 
     (
      [day_of_weeks] => Wednesday 
      [start_time] => 6:00 PM 
      [end_time] => 7:00 PM 
     ) 

    [3] => Array 
     (
      [day_of_weeks] => Friday 
      [start_time] => 5:00 PM 
      [end_time] => 6:00 PM 
     ) 

    [4] => Array 
     (
      [day_of_weeks] => Saturday 
      [start_time] => 5:00 PM 
      [end_time] => 6:00 PM 
     ) 

    [5] => Array 
     (
      [day_of_weeks] => Sunday 
      [start_time] => 5:00 PM 
      [end_time] => 6:00 PM 
     ) 

) 

像这样

Array(
    [0] => Array 
    (
     [day_of_weeks] => Monday 
     [day_of_weeks] => Tuesday 
     [day_of_weeks] => Wednesday 
     [start_time] => 6:00 PM 
     [end_time] => 7:00 PM 
    ) 
    [1] => Array 
    (
     [day_of_weeks] => Friday 
     [day_of_weeks] => Saturday 
     [day_of_weeks] => Sunday 
     [start_time] => 5:00 PM 
     [end_time] => 6:00 PM 
    ) 
) 

在打破阵列两个不同的阵列

并且数据是从数据库动态传入的。请帮助我

Answer 1

这不是一个完整的解决方案，但可能给你如何进行的一些想法：

$array = array(
    array(
    'day_of_weeks' => 'Monday', 
    'start_time' => '6:00 PM', 
    'end_time' => '7:00 PM' 
), 
    array(
    'day_of_weeks' => 'Tuesday', 
    'start_time' => '6:00 PM', 
    'end_time' => '7:00 PM' 
), 
    array(
    'day_of_weeks' => 'Friday', 
    'start_time' => '5:00 PM', 
    'end_time' => '6:00 PM' 
) 
); 
$result = array(); 

// walk over each element of the original array 
array_walk($array, function(&$item, $key) use (&$result) { 
    // if the key denoted by `start_time` exists append the `day_of_weeks` 
    if(array_key_exists($item['start_time'], $result)) { 
     $result[$item['start_time']]['day_of_weeks'][] = $item['day_of_weeks']; 
    } else { 
     // make `day_of_weeks` an array that can hold more values 
     $result[$item['start_time']] = array(
     'start_time' => $item['start_time'], 
     'end_time' => $item['end_time'], 
     'day_of_weeks' => array($item['day_of_weeks']) 
    ); 
    } 
}); 

// the output of $result would be 
Array 
(
    [6:00 PM] => Array 
    (
     [start_time] => 6:00 PM 
     [end_time] => 7:00 PM 
     [day_of_weeks] => Array 
     (
      [0] => Monday 
      [1] => Tuesday 
     ) 
) 
    [5:00 PM] => Array 
    (
     [start_time] => 5:00 PM 
     [end_time] => 6:00 PM 
     [day_of_weeks] => Array 
     (
      [0] => Friday 
     ) 
) 
) 

也许你应该能够改变你的MySQL查询，以获得所需的输出。例如运行下表对这个查询：

SELECT GROUP_CONCAT(day_of_weeks) day_of_weeks, 
     start_time, 
     end_time 
FROM data 
GROUP BY start_time 
ORDER BY start_time DESC; 

+--------------+------------+----------+ 
| day_of_weeks | start_time | end_time | 
+--------------+------------+----------+ 
| Monday  | 6:00 PM | 7:00 PM | 
| Tuesday  | 6:00 PM | 7:00 PM | 
| Wednesday | 6:00 PM | 7:00 PM | 
| Friday  | 5:00 PM | 6:00 PM | 
| Saturday  | 5:00 PM | 6:00 PM | 
| Sunday  | 5:00 PM | 6:00 PM | 
+--------------+------------+----------+ 

上面的例子将返回属于由,字符分隔同一start_time所有天。请注意，end_time的值并未真正使用，对于前一个使用array_walk()的示例也是如此。

+--------------------------+------------+----------+ 
| day_of_weeks    | start_time | end_time | 
+--------------------------+------------+----------+ 
| Monday,Tuesday,Wednesday | 6:00 PM | 7:00 PM | 
| Friday,Saturday,Sunday | 5:00 PM | 6:00 PM | 
+--------------------------+------------+----------+ 

然后，您可以使用explode()或相似得到的每一天：

foreach($results as $record) { 
    $days = explode(",", $record['day_of_weeks']; 
} 

Answer 2

首先，因为你已经写在你需要的输出，你不能有多个不同的值day_of_weeks，但是可以使day_of_weeks一个包含日期名称的数组。

此外，由于它看起来像是在您的输出中使用了start_time和end_time作为唯一键，所以我建议在数组键中使用它们来简化程序。

所以这给了我们：

$output_array = array(); 
foreach ($input_array as $data_item) { 
    $time_key = $data_item['start_time'] . ' - ' . $data_item['end_time']; 
    if (isset($output_array[$time_key]['day_of_weeks'])) { 
     $output_array[$time_key]['day_of_weeks'][] = $data_item['day_of_weeks']; 
    } else { 
     $output_array[$time_key] = array(
      'day_of_weeks' => array($data_item['day_of_weeks']), 
      'start_time' => $data_item['start_time'], 
      'end_time'  => $data_item['end_time'], 
     ); 
    } 
} 

这将导致：

Array(
    ['6:00 PM - 7:00 PM'] => Array 
    (
     [day_of_weeks] => Array(
      [0] => Monday, 
      [1] => Tuesday, 
      [2] => Wednesday, 
     ), 
     [start_time] => 6:00 PM 
     [end_time] => 7:00 PM 
    ) 
    ['5:00 PM - 6:00 PM'] => Array 
    (
     [day_of_weeks] => Array(
      [0] => Friday, 
      [1] => Saturday, 
      [2] => Sunday, 
     ), 
     [start_time] => 5:00 PM 
     [end_time] => 6:00 PM 
    ) 
)