按值拆分php数组

我有这个数组

array
  0 => 
    array

      'prodid' => string '2' (length=1)
      'qty' => int 2
      'price' => string '100.00' (length=6)
      'sid' => string '13' (length=2)
  2 => 
    array

      'prodid' => string '3' (length=1)
      'qty' => int 1
      'price' => string '380.00' (length=6)
      'sid' => string '13' (length=2)
  1 => 
    array

      'prodid' => string '8' (length=1)
      'qty' => int 1
      'price' => string '300.00' (length=6)
      'sid' => string '24' (length=2)

我如何将其拆分为一个多维数组，其中的值“sid”如此匹配

array
  0 => 
    array

      0 => 
        array
          'prodid' => string '2' (length=1)
          'qty' => int 2
          'price' => string '100.00' (length=6)
          'sid' => string '13' (length=2)
      1 => 
        array
          'prodid' => string '2' (length=1)
          'qty' => int 2
          'price' => string '100.00' (length=6)
          'sid' => string '13' (length=2)

  1 => 
    array

      0 => 
        array
          'prodid' => string '7' (length=1)
          'qty' => int 1
          'price' => string '200.00' (length=6)
          'sid' => string '15' (length=2)

---

选择要分组的值作为新数组的键，并将成员推送到该值

$new = array();
foreach($array as $member)
{
    $key = $member['group-value'];
    $new[$key][] = $member;
}

然后使用

array\u values

从新数组中提取裸值：

$new = array_values($new);

就这样。如果您想保留最后一部分，还可以自己创建键映射及其数字索引：

$new = array();
$keys = array();
foreach($array as $member)
{
    $key = $member['group-value'];
    isset($keys[$key]) || $keys[$key] = count($keys);        
    $new[$keys[$key]][] = $member;
}

---

选择要分组的值作为新数组的键，并将成员推送到该值

$new = array();
foreach($array as $member)
{
    $key = $member['group-value'];
    $new[$key][] = $member;
}

然后使用

array\u values

从新数组中提取裸值：

$new = array_values($new);

就这样。如果您想保留最后一部分，还可以自己创建键映射及其数字索引：

$new = array();
$keys = array();
foreach($array as $member)
{
    $key = $member['group-value'];
    isset($keys[$key]) || $keys[$key] = count($keys);        
    $new[$keys[$key]][] = $member;
}

注意：这会产生与您描述的稍有不同的输出，因为它使用

sid

作为数组键，而不仅仅是从0索引它们：

array
  // Note key difference...
  // sid == 13
  13 => 
    array
      0 => 
        array
          'prodid' => string '2' (length=1)
          'qty' => int 2
          'price' => string '100.00' (length=6)
          'sid' => string '13' (length=2)
      1 => 
        array
          'prodid' => string '2' (length=1)
          'qty' => int 2
          'price' => string '100.00' (length=6)
          'sid' => string '13' (length=2)
  // sid == 15
  15 => 
    array

      0 => 
        array
          'prodid' => string '7' (length=1)
          'qty' => int 1
          'price' => string '200.00' (length=6)
          'sid' => string '15' (length=2)

注意：这会产生与您描述的稍有不同的输出，因为它使用

sid

作为数组键，而不仅仅是从0索引它们：

array
  // Note key difference...
  // sid == 13
  13 => 
    array
      0 => 
        array
          'prodid' => string '2' (length=1)
          'qty' => int 2
          'price' => string '100.00' (length=6)
          'sid' => string '13' (length=2)
      1 => 
        array
          'prodid' => string '2' (length=1)
          'qty' => int 2
          'price' => string '100.00' (length=6)
          'sid' => string '13' (length=2)
  // sid == 15
  15 => 
    array

      0 => 
        array
          'prodid' => string '7' (length=1)
          'qty' => int 1
          'price' => string '200.00' (length=6)
          'sid' => string '15' (length=2)

对于PHP5.3+

$result = array_reduce (
  $array,
  function ($item, $result) {
    if (!isset($result[$item['sid']])) $result[$item['sid']] = array();
    $result[$item['sid']][] = $item;
    return $result;
  },
  array()
)

对于PHP5.3+

$result = array_reduce (
  $array,
  function ($item, $result) {
    if (!isset($result[$item['sid']])) $result[$item['sid']] = array();
    $result[$item['sid']][] = $item;
    return $result;
  },
  array()
)