php二维数组按某个键值排序的实例讲解

排序前

Array
(
  [0] => Array
    (
      [name] => 龙
      [age] => 2017-02-28
    )
  [1] => Array
    (
      [name] => 龙2
      [age] => 2017-03-14
    )
  [2] => Array
    (
      [name] => 小3
      [age] => 2017-05-09
    )
  [3] => Array
    (
      [name] => 龙4
      [age] => 2017-02-03
    )
  [4] => Array
    (
      [name] => 龙5
      [age] => 2017-03-23
    )
  [5] => Array
    (
      [name] => 龙6
      [age] => 21
    )
)
array_multisort(array_column($arr,'age'),SORT_DESC,$arr);
print_r($arr);

排序后

Array
(
  [0] => Array
    (
      [name] => 龙6
      [age] => 21
    )
  [1] => Array
    (
      [name] => 小3
      [age] => 2017-05-09
    )
  [2] => Array
    (
      [name] => 龙5
      [age] => 2017-03-23
    )
  [3] => Array
    (
      [name] => 龙2
      [age] => 2017-03-14
    )
  [4] => Array
    (
      [name] => 龙
      [age] => 2017-02-28
    )
  [5] => Array
    (
      [name] => 龙4
      [age] => 2017-02-03
    )
)

其中 array_column(数组,数组中的某个键值)  从多维数组中取出某个键值的一列  返回一个一维数组；

array_multisort(数组(一维数组),排序方式(SOTR_ASC,SOTR_DESC),其他数组(可以是二维的))

总结

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