php - 从数组中删除在指定键上具有重复值的元素

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， 并得到:

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"
  )
 )

谢谢。

Answer 1

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