Question

如果我有这样的数组：

Array (
  [0]=>
  Array (
    ["id"]=> "1"
    ["desc"]=> "desc 1"
    ["type"]=> "T"
    ["date"]=> "17-JAN-12"
  )
  [1]=>
  Array (
    ["id"]=> "2"
    ["desc"]=> "desc 2"
    ["type"]=> "P"
    ["date"]=> "05-JAN-12"
  )
  [2]=>
  Array (
    ["id"]=> "1"
    ["desc"]=> "desc 3"
    ["type"]=> "P"
    ["date"]=> "15-JAN-12"
  )
  [3]=>
  Array (
    ["id"]=> "3"
    ["desc"]=> "desc 4"
    ["type"]=> "P"
    ["date"]=> "06-JAN-12"
  )
  [4]=>
  Array (
    ["id"]=> "2"
    ["desc"]=> "desc 5"
    ["type"]=> "T"
    ["date"]=> "06-JAN-12"
  )
 )

我想从中删除仅在键“id”上具有重复值的元素，得到：

Array (
  [0]=>
  Array (
    ["id"]=> "1"
    ["desc"]=> "desc 1"
    ["type"]=> "T"
    ["date"]=> "17-JAN-12"
  )
  [1]=>
  Array (
    ["id"]=> "2"
    ["desc"]=> "desc 2"
    ["type"]=> "P"
    ["date"]=> "05-JAN-12"
  )
  [2]=>
  Array (
    ["id"]=> "3"
    ["desc"]=> "desc 4"
    ["type"]=> "P"
    ["date"]=> "06-JAN-12"
  )
 )

感谢。

Answer 1

$result = array();
foreach($array as $arr){
   if(!isset($result[$arr["id"]])){
      $result[$arr["id"]] = $arr;
   }
}

Answer 2

似乎id是您的主要键。所以只有当id不存在时才循环遍历数组并将元素插入新数组。

$new_array = array();
foreach ($old_array as $entry) {
    if (empty($new_array[$entry['id']])) $new_array[$entry['id']] = $entry;
}
$new_array = array_values($new_array);

顺便说一句。最后一行仅用于在最终数组中重新排序键

php - 从数组中删除在指定键上具有重复值的元素

2 个答案: