获取数组PHP中数组的唯一数组元素

Question

我有以下数组

Array
(
     [0] => Array(
         [0] => Water
         [1] => 0.5555)
     [1] => Array(
         [0] => Jojoba Oil
         [1] => 1)
     [2] => Array(
         [0] => Water
         [1] => 0.3)
     [3] => Array(
         [0] => Coconut Extract
         [1] => 1.2)
     [4] => Array(
         [0] => Walnut Extract
         [1] => 1.1)
     [5] => Array(
         [0] => Water
         [1] => 0.5555)
     [6] => Array(
         [0] => Peptide 1
         [1] => 2)
     [7] => Array(
         [0] => Preservative
         [1] => 0.5555)
)

我需要以下输出（通过添加重复键的值并显示一次，例如'Water'）

Array(
[Peptide 1] => 2 
[Water] => 1.411 
[Coconut Extract] => 1.2 
[Walnut Extract] => 1.1 
[Jojoba Oil] => 1 
[Preservative] => 0.5555
)

var dump output： -

并按desc顺序排序 Thanx提前...