数组合并到多维数组。-arraymergingintomultidimensionalarray

2  

This should work.

这应该工作。

$output = getMergedArray($input); // $input is your sample array

function getMergedArray($input_array) {
  $output_array = array();
  foreach ($input_array as $key => $value) {
    $event_id = $value['event_id'];
    $time = $value['time'];
    $day = $value['day'];
    $day_id = getDay($output_array, $day);
    if (count($output_array) > 0 && $day_id >= 0) {
      if (!is_array($output_array[$day_id]['event_id'])) {
        $output_array[$day_id]['event_id'] = array($output_array[$day_id]['event_id']);
        $output_array[$day_id]['time'] = array($output_array[$day_id]['time']);
      }
      array_push($output_array[$day_id]['event_id'],$event_id);
      array_push($output_array[$day_id]['time'],$time);
    } else {
      $output_array[] = $value;
    }
  }
  return $output_array;
}

function getDay($output_array, $day) {
  if (count($output_array) > 0)
    foreach($output_array as $key => $value)
      if ($value['day'] == $day)
        return $key;

  return -1;
}

2  

I can't think of a built in function that will do this for you. I think you will have to loop through, group the events by day, then loop through the group and convert to the correct output format.

我想不出一个内建函数能帮到你。我认为您必须循环遍历，按天对事件进行分组，然后循环遍历该组，并将其转换为正确的输出格式。

E.g.

如。

This does not take into account the fact that the days may not always be in the same case, and also does not order the events by time, which may also be required.

这并没有考虑到这样一个事实，即天不一定总是在同一种情况下，而且也不按时间顺序排列事件，这也可能是必需的。

function convert_event_array ($array) {

  // Declare the arrays we will use
  $temp = array(
    // Declare the day keys, so they appear in the right order in the output
    'Monday'=>array(),
    'Tuesday'=>array(),
    'Wednesday'=>array(),
    'Thursday'=>array(),
    'Friday'=>array(),
    'Saturday'=>array(),
    'Sunday'=>array()
  );
  $out = array();

  // Put events into temp array, grouped by day
  foreach ($array as $event) $temp[$event['day']][] = array('event_id'=>$event['event_id'],'time'=>$event['event_id']);

  // Convert grouped array to the correct format
  foreach ($temp as $day => $events) if (count($events)) {
    $index = count($out);
    foreach ($events as $event) {
      $out[$index]['event_id'][] = $event['event_id'];
      $out[$index]['time'][] = $event['time'];
    }
    $out[$index]['day'] = $day;
  }

  return $out;

}

print_r(convert_event_array($myInputArry));

2  

I 'd propose this method which is fully generic and extensible:

我建议这个方法是完全通用和可扩展的:

// YOUR INPUT GOES HERE
$input = (...);

// Stage 1: group elements of the initial array into sub-arrays based on their 'day' key
$groupLambda = function($aggr, $val) {
                   $aggr[$val['day']][] = $val; return $aggr;
               };
$grouped = array_reduce($input, $groupLambda, array());

// Stage 2: for each "same day" group, make an array of values for each property
//          instead of an array of items with scalar properties
$coalesceLambda = function($group) {
                      $mapLambda = function($aggr, $val) {
                          foreach($val as $k => $v) {
                              if($k == 'day') continue;
                              $aggr[$k][] = $v; 
                          }
                          return $aggr;
                      };
                      return array_reduce($group, $mapLambda, array());
                  };
$coalesced = array_map($coalesceLambda, $grouped);

// Get the result
print_r($coalesced);

Advantages:

优点:

1. There is only one magic value (the string "day"), which can be easily made into a variable and the whole thing factored out into a function (so you could reuse this function to perform the same transformation over any other property you might want to).
2. 只有一个神奇的值(字符串“day”)，它可以很容易地变成一个变量，整个东西可以分解成一个函数(因此您可以重用这个函数，对任何其他您可能想要的属性执行相同的转换)。
3. Should be plenty fast due to using the built-in functions array_reduce and array_map instead of manually doing the same work in PHP.
4. 由于使用内置函数array_reduce和array_map而不是在PHP中手工执行相同的工作，所以应该会非常快。

Disadvantages:

缺点:

1. Requires PHP >= 5.3 due to the use of anonymous functions and the third parameter of array_reduce.
2. 由于使用匿名函数和array_reduce的第三个参数，需要PHP >= 5.3。
3. Not very easy to understand (although code that does this kind of data massaging won't be too easy to visualize in any case).
4. 理解起来并不容易(尽管做这种数据处理的代码在任何情况下都不太容易可视化)。