php 对二位数组按某个键值排序

• 如下—-按照某个字段降序排列

<?php$arr =array(array('id'=>2,'price'=>100,'num'=>1),array('id'=>3,'price'=>123,'num'=>1),array('id'=>6,'price'=>115,'num'=>1),array('id'=>7,'price'=>95,'num'=>1),array('id'=>8,'price'=>138,'num'=>1)
);

array_multisort(array_column($arr,'price'),SORT_DESC,$arr);
print_r($arr);?>

输出结果：

Array
(
    [0] =>Array
        (
            [id] =>8
            [price] =>138
            [num] =>1
        )

    [1] =>Array
        (
            [id] =>3
            [price] =>123
            [num] =>1
        )

    [2] =>Array
        (
            [id] =>6
            [price] =>115
            [num] =>1
        )

    [3] =>Array
        (
            [id] =>2
            [price] =>100
            [num] =>1
        )

    [4] =>Array
        (
            [id] =>7
            [price] =>95
            [num] =>1
   `
    )

)

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),排序方式自行选择(SOTR_ASC,SOTR_DESC),其他数组(可以是二维的))