获取数组中重复键值的值以相互添加

Question

我的代码就像这样

// $t = new ProjectProgressDao();
// $progressValues = $t->getRecords($projectId);

foreach ($progressValues as $Values) {

  $weekStartingDays[$this->CalculateWeekStartDate($Values->getDate())] = $Values->getWorkCompleted();
}

基本上我想要的是???

 Array
    (
        [a1]=>'k'
        [a2]=>'a' 
        [a1]=>'w'
        [a1]=>'z'

     }

我想要

 Array
    (
        [a1]=>'k+w+z'
        [a3]=>'w'
        [a4]=>'z'

     )

a，b等是数值

Answer 1

只需添加值，如果尚未设置，则将位置初始化为0：

foreach ($progressValues as $Values) {
  if (!isset($weekStartingDays[$this->CalculateWeekStartDate($Values->getDate())])) {
    $weekStartingDays[$this->CalculateWeekStartDate($Values->getDate())]=0;
  }
  $weekStartingDays[$this->CalculateWeekStartDate($Values->getDate())] += $Values->getWorkCompleted();
}