从多值数组中获取单值数组的最佳方法

Question

Have array like this:

Array
(
    [0] => Array
        (
            [Slot_id] => 7048,
            [name] => value
        )

    [1] => Array
        (
            [Slot_id] => 7049,
            [name] => value
        )

)

I want to get the below array form

 Slot_id => Array
    (
       [0] => 7048,
       [1] => 7049
     )

currently i am using foreach function, any other best method?

Answer 1

If you are using PHP >= 5.5 then array_column is the solution:

$result = array_column($input, 'Slot_id');

For earlier versions, either manually foreach or alternatively:

• with array_map:

  // assumes PHP 5.3 for lambda function, for earlier PHP just do foreach
  $result = array_map(function($row) { return $row['Slot_id']; }, $input);
  

• with array_walk:

  // assumes PHP 5.4 for short array syntax, for 5.3 use array() instead of []
  $result = [];
  array_walk($input, function($row) use (&$result) { $result[] = $row['Slot_id']; });