PHP合并与和阵列 [英] PHP merge and sum arrays

问题描述

我有一个数组 $ vd_arr

array (size=3)
  0 => 
    array (size=3)
      'delivnote_id' => string '1' (length=1)
      'qty' => string '76' (length=2)
      'id' => int 17
  1 => 
    array (size=3)
      'delivnote_id' => string '1' (length=1)
      'qty' => string '87' (length=2)
      'id' => int 16
  2 => 
    array (size=3)
      'delivnote_id' => string '1' (length=1)
      'qty' => string '889' (length=3)
      'id' => int 17

我需要通过ID和数量值的总和进行合并，这样的结果将是：

I need to merge by id and sum of qty value, so result will be:

array (size=2)
  0 => 
    array (size=3)
      'id' => int 17
      'qty' => int 965
      'delivnote_id' => string '1' (length=1)
  1 => 
    array (size=3)
      'id' => int 16
      'qty' => int 87
      'delivnote_id' => string '1' (length=1)

这个脚本做的工作，但是PHP注意到我未定义指数：数量

$vendel = array();
$indexArray = array();
foreach ($vd_arr as $miniarray) {
  $vendel[$miniarray['id']]['id'] = $miniarray['id'];
  $vendel[$miniarray['id']]['qty'] += $miniarray['qty'];
  $vendel[$miniarray['id']]['delivnote_id'] = $miniarray['delivnote_id'];
}

foreach($vendel as $value) {
  $indexArray[] = $value;
}

return $indexArray;

如何避免未定义指数从上面的脚本？谢谢。

推荐答案

试试这个

$vendel = array();
$indexArray = array();
foreach ($vd_arr as $miniarray) {
  $vendel[$miniarray['id']]['id'] = $miniarray['id'];

  if(isset($vendel[$miniarray['id']]['qty']))
  {
      $vendel[$miniarray['id']]['qty'] += $miniarray['qty'];
  }
  else 
  {
      $vendel[$miniarray['id']]['qty'] = $miniarray['qty'];
  } 

  $vendel[$miniarray['id']]['delivnote_id'] = $miniarray['delivnote_id'];
}

foreach($vendel as $value) {
  $indexArray[] = $value;
}

return $indexArray;

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