php - array_column 不适用于对象数组？

Question

这是我当前的数组结构:

array(2) {
  ["Ground"] => array(4) {
    [0] => object(Shipping\Model\Shipping)#337 (5) {
      ["shipping_id"] => NULL
      ["min_weight"] => string(4) "0.00"
      ["max_weight"] => string(4) "5.00"
      ["shipping_method"] => string(6) "Ground"
      ["shipping_rate"] => string(4) "8.00"
    }
    [1] => object(Shipping\Model\Shipping)#385 (5) {
      ["shipping_id"] => NULL
      ["min_weight"] => string(4) "6.00"
      ["max_weight"] => string(5) "10.00"
      ["shipping_method"] => string(6) "Ground"
      ["shipping_rate"] => string(5) "12.00"
    }
  }
  ["Expedited"] => array(4) {
    [0] => object(Shipping\Model\Shipping)#388 (5) {
      ["shipping_id"] => NULL
      ["min_weight"] => string(4) "0.00"
      ["max_weight"] => string(4) "5.00"
      ["shipping_method"] => string(9) "Expedited"
      ["shipping_rate"] => string(5) "12.00"
    }
  }
}

每次我为 max_weight 运行 array_column 时，都会得到一个空数组。我应该将返回的数组用于 max()。有解决方法吗？

Answer 1

v7.0.0: Added the ability for the input parameter to be an array of objects.

来源:https://secure.php.net/manual/en/function.array-column.php