我有一个数组
Array
(
[0] => Array
(
[order_id] => 1318
[code] => shipping
[title] => UK Shipping (Weight: 0.00kg)
[value] => 10.2000
)
[1] => Array
(
[order_id] => 1318
[code] => sub_total
[title] => Sub-Total
[value] => 4.7000
)
[2] => Array
(
[order_id] => 1318
[code] => coupon
[title] => Coupon (10P)
[value] => -0.4700
)
[3] => Array
(
[order_id] => 1318
[code] => tax
[title] => VAT (20%)
[value] => 2.8860
[sort_order] => 8
)
[4] => Array
(
[order_id] => 1318
[code] => total
[title] => Total
[value] => 17.3160
)
)
我想交换数组索引。我想在[code]=>优惠券到[code]=>sub_total时交换数组索引，如果优惠券可用。我希望优惠券的位置在小计之上。我希望sub_total的位置在大桶上方。这怎么可能？请帮帮我。
您可以定义一个自定义排序顺序数组，将code的每个可能值按所需顺序排列。
$custom_sort_order = array(
'shipping' => 1,
'coupon' => 2,
'sub_total' => 3,
'tax' => 4,
'total' => 5);
那么您可以在usort的比较函数中使用该自定义排序顺序来获得所需顺序的数组项。
usort($your_array, function($x, $y) use ($custom_sort_order) {
// find the sort number for each item
$x = $custom_sort_order[$x['code']];
$y = $custom_sort_order[$y['code']];
// do the comparison
if ($x == $y) return 0;
return $x - $y;
});