Question

我有一个数组，我想根据2值排序。首先，我想根据c_gpa值对其进行排序。如果c_gpa值与数组中的其他值相等，则排序t_mark值。

这是我的数组

$array = array(
        [0]=>array(
            "roll_number" => 1,
            "c_gpa" => 4.8,
            "t_mark"=>750
        ),
        [1] => array(
            "roll_number" => 2,
            "c_gpa" => 4.12,
            "t_mark"=>530
        ),
        [2] => array(
            "roll_number" => 3,
            "c_gpa" => 4.12,
            "t_mark"=>550
        )

）;

我在下面编写了排序c_gpa值的代码但是有2个值是相同的（4.12）所以我想对它排序't_mark'值这些数组

usort($array, "all_filter");
    function all_filter($a,$b) {
        return $a['c_gpa'] < $b['c_gpa'];

     }

我的预期输出是。

$array = array(
        [0]=>array(
            "roll_number" => 1,
            "c_gpa" => 4.8,
            "t_mark"=>750
        ),
        [1] => array(
            "roll_number" => 3,
            "c_gpa" => 4.12,
            "t_mark"=>550
        ),          
        [2] => array(
            "roll_number" => 2,
            "c_gpa" => 4.12,
            "t_mark"=>530
        )

）;

提前致谢!!!

Answer 1

您可以使用array_multisort函数执行此操作。

<?php
// Obtain a list of columns
foreach ($array as $key => $row) {
    $c_gpa[$key]  = $row['c_gpa'];
    $t_mark[$key] = $row['t_mark'];
}

// Sort the data array with $c_gpa ASC, $t_mark ASC
// Add $data as the last parameter, to sort by the common key
array_multisort($c_gpa, SORT_DESC, $t_mark, SORT_ASC, $array);
var_dump($array);
?>

array_multisort documentation

Answer 2

如果您想使用usort()，可以像这样使用它，demo

   <?php
    $array = array(
            array(
                "roll_number" => 1,
                "c_gpa" => 4.8,
                "t_mark"=>750
            ),
            array(
                "roll_number" => 2,
                "c_gpa" => 4.12,
                "t_mark"=>530
            ),
            array(
                "roll_number" => 3,
                "c_gpa" => 4.12,
                "t_mark"=>550
            ));
    usort($array, function($a, $b){
      return $a['c_gpa'] > $b['c_gpa'] ? true : $a['c_gpa'] < $b['c_gpa'] ? false : $a['t_mark'] < $b['t_mark'] ? true : false;
    });
    var_dump($array);

如何根据2值对数组进行排序

2 个答案: