PHP：array_column从多维数组中取出单列值

array_column(array $array, $column, $index_key = null)

<?php
$list = [
    [
        'id'   => 1,
        'name' => 'Tom',
        'age'  => 23
    ],
    [
        'id'   => 2,
        'name' => 'Jack',
        'age'  => 24
    ]
];
// 从2维数组中取name列为值
print_r(array_column($list, 'name'));
// 从2维数组中取name列为值，id列为键
print_r(array_column($list, 'name', 'id'));
// 从2维数组中取整个元素为值，id列为键
print_r(array_column($list, null, 'id'));

Array
(
    [0] => Tom
    [1] => Jack
)
Array
(
    [1] => Tom
    [2] => Jack
)
Array
(
    [1] => Array
        (
            [id] => 1
            [name] => Tom
            [age] => 23
        )
    [2] => Array
        (
            [id] => 2
            [name] => Jack
            [age] => 24
        )
)