在 PHP 7.4 中，在索引数组中添加元素至特定的位置（array_splice）

$blockOrder = [
	"title",
	"subtitle",
	"price",
	"on-site-message",
	"variants",
	"count",
	"merit-0",
	"merit-1",
	"merit-2",
	"merit-3",
	"payment"
];

$blockOrder = [
	"title",
	"subtitle",
	"price",
	"on-site-message",
	"variants",
	"count",
	"merit-0",
	"merit-1",
	"merit-2",
	"merit-3",
	"payment"
];

print_r($blockOrder);

$blockOrder2 = [
	"automatic-discount-tag",
	"automatic-discount-bxgety"
];

array_splice($blockOrder, 3, 0, $blockOrder2);

print_r($blockOrder);

Array
(
    [0] => title
    [1] => subtitle
    [2] => price
    [3] => on-site-message
    [4] => variants
    [5] => count
    [6] => merit-0
    [7] => merit-1
    [8] => merit-2
    [9] => merit-3
    [10] => payment
)
Array
(
    [0] => title
    [1] => subtitle
    [2] => price
    [3] => automatic-discount-tag
    [4] => automatic-discount-bxgety
    [5] => on-site-message
    [6] => variants
    [7] => count
    [8] => merit-0
    [9] => merit-1
    [10] => merit-2
    [11] => merit-3
    [12] => payment
)