在PHP多维数组中使用USORT之后如何添加新密钥

Question

我在该数组中有一个数组我想进行ASC排序，之后我要插入新的列rank然后它的值将像1，2，3一样增加...

我的阵列

$mainArray = [
    "key1" => ["name" => "A", "price" => 5],
    "key2" => ["name" => "B", "price" => 7],
    "key3" => ["name" => "C", "price" => 2],
];

我的密码

usort($mainArray, function($a, $b) {
                return $a['price'] <=> $b['price'];
 });
echo "<pre>";
print_r($mainArray);

我正在输出

Array
(
    [0] => Array
        (
            [name] => C
            [price] => 2
        )

    [1] => Array
        (
            [name] => A
            [price] => 5
        )

    [2] => Array
        (
            [name] => B
            [price] => 7
        )

)

预期产量

Array
(
    [0] => Array
        (
            [name] => C
            [price] => 2
            [rank] => 1
        )

    [1] => Array
        (
            [name] => A
            [price] => 5
            [rank] => 2
        )

    [2] => Array
        (
            [name] => B
            [price] => 7
            [rank] => 3
        )

)

Answer 1

由于数组已经排序并重新索引，因此rank值只是键加1。foreach循环将完成您想要的操作：

foreach ($mainArray as $k => &$v) {
    $v['rank'] = $k + 1;
}

3v4l.org上的演示