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$arr = [
    [0, 1],
    [2, 3],
    [4, 5],
    [6, 7],
];

$a1 = array_column($arr, '0');
$a2 = array_column($arr, 0);

print_r($a1);//Array ( )
print_r($a2);//Array ( [0] => 0 [1] => 2 [2] => 4 [3] => 6 )

特殊用法（这个在重置索引，很管用）：

$goods_detail_list = [
    ['goods_id' => 2, 'nm' => '333'],
    ['goods_id' => 5, 'nm' => '555'],
    ['igoods_idd' => 7, 'nm' => '8888'],
];

$c = array_column($goods_detail_list, null, 'goods_id');

print_r($c);

/*
Array
(
    [2] => Array
        (
            [goods_id] => 2
            [nm] => 333
        )

    [5] => Array
        (
            [goods_id] => 5
            [nm] => 555
        )

    [6] => Array
        (
            [igoods_idd] => 7
            [nm] => 8888
        )

)
 */