如何在php中的关联数组的开头插入项目

Question

我目前正在尝试根据日期和名称对数据进行分组。这是我的代码

    $data = [];
    foreach($allmatches as $d){
       $name = $d['div']['divisionName'];
       $data[$d['playingDate']][$name][]=$d;
       $data[$d['playingDate']]['day']=$d['day'];
       $data[$d['playingDate']]['month']=$d['month'];
       $data[$d['playingDate']]['isToday']=$d['isToday'];
    }
    return $data;

OUTPUT 
======
2018-09-18: {
  Elitserien: [+],
  day: "18",
  month: "Sep",
  isToday: true,
  Division 2: [+],
  Division 5: [+]
},

当前输出以Elitserien开头，但我想在一开始就达到Division 5。

为进一步帮助，这是当前数据的图片

我想总是在数组的开头插入新元素。我该怎么做？非常感谢。

Answer 1

您可以简单地使用+运算符：

$data = [];
foreach($allmatches as $d){

   $name = $d['div']['divisionName'];

   // Prepare a temp array
   $temp = array();
   $temp[$name][]   = $d;
   $temp['day']     = $d['day'];
   $temp['month']   = $d['month'];
   $temp['isToday'] = $d['isToday'];

   // Add to the beginning of $data array (first-level)
   $data = array($d['playingDate'] => $temp) + $data;
}
return $data;

Answer 2

由于您使用的是关联数组，因此需要使用array_merge来添加序列数据（即，由$name索引的数据到$data[$d['playingDate']]数组的开头。此代码将做您想要的事情。请注意，我将系列代码放在最后，以避免必须检查$data[$d['playingDate']]和$data[$d['playingDate']][$name]的设置。

$data = [];
foreach($allmatches as $d){
   $name = $d['div']['divisionName'];
   $data[$d['playingDate']]['day']=$d['day'];
   $data[$d['playingDate']]['month']=$d['month'];
   $data[$d['playingDate']]['isToday']=$d['isToday'];
   if (!isset($data[$d['playingDate']][$name])) $data[$d['playingDate']] = array_merge(array($name => array()), $data[$d['playingDate']]);
   $data[$d['playingDate']][$name][]=$d;
}

我创建了一个小的demo on 3v4l.org

Answer 3

array_unshift()功能将解决您的问题。