我有一个名为$_POST的关联数组。这个数组本质上是动态的，也就是说它可以包含任何no。的元素。为了供您参考，我已经生成了只有两个元素的$_POST数组。该数组的内容如下:
Array
(
[op] => preview
[id] =>
[form_submitted] => yes
[company_id] => 46
[product_id_1] => Array
(
[1] => 10
[2] => 9
)
[pack] => Array
(
[1] => 10
[2] => 50
)
[quantity] => Array
(
[1] => 20
[2] => 60
)
[volume] => Array
(
[1] => 30
[2] => 70
)
[units] => Array
(
[1] => 7
[2] => 12
)
[amount] => Array
(
[1] => 40
[2] => 80
)
[rebate_start_date] => Array
(
[1] => 2014-05-01
[2] => 2014-06-01
)
[rebate_expiry_date] => Array
(
[1] => 2014-05-31
[2] => 2014-06-30
)
[applicable_states] => Array
(
[1] => Array
(
[0] => 3
[1] => 4
[2] => 10
[3] => 15
[4] => 17
)
[2] => Array
(
[0] => 44
[1] => 45
[2] => 47
[3] => 49
[4] => 50
)
)
[multiselect] => 50
[rebate_total_count] => Array
(
[1] => 5000
[2] => 10000
)
[product_id_2] => Array
(
[1] => 11
[2] => 8
)
)
现在我想要一个新的数组，在这样的方式下，所有的数据相同的索引应该在一个键的值等于该索引。如果你对我的要求感到困惑，看看下面我想生成的数组:
Array
(
[op] => preview
[id] =>
[form_submitted] => yes
[company_id] => 46
[1] => Array
(
[pack] => 10
[quantity] => 20
[volume] => 30
[units] => 7
[amount] => 40
[rebate_start_date] => 2014-05-01
[rebate_expiry_date] => 2014-05-31
[rebate_total_count] => 5000
[applicable_states] => Array
(
[0] => 3
[1] => 4
[2] => 10
[3] => 15
[4] => 17
)
[product_id_1] => Array
(
[1] => 10
[2] => 9
)
)
[2] => Array
(
[pack] => 50
[quantity] => 60
[volume] => 70
[units] => 12
[amount] => 80
[rebate_start_date] => 2014-06-01
[rebate_expiry_date] => 2014-06-30
[rebate_total_count] => 10000
[applicable_states] => Array
(
[0] => 44
[1] => 45
[2] => 47
[3] => 49
[4] => 50
)
[product_id_2] => Array
(
[1] => 11
[2] => 8
)
)
[multiselect] => 50
)
在上面的数组中，可以看到所有匹配索引的数据都在同一个键下。还有一件事我想告诉你，键[applicable_states]和[rebate_total_count]可能包含空白值。在操作数组$_POST以生成包含同一键下相同索引的所有数据的数组时，也应该考虑到这一点。如何通过使用现成的数组函数和一些神奇的逻辑在PHP的最佳方式实现这一点?谢谢你！
$new_array = array();
foreach ($_POST as $key => $val) {
if (!is_array($val)) {
$new_array[$key] = $val;
} elseif (preg_match('/^product_id_('d+)$/', $key, $match)) {
$i = $match[1];
if (isset($new_array[$i])) {
$new_array[$i][$key] = $val;
} else {
$new_array[$i] = array($key => $val);
}
} else {
foreach ($val as $i => $subval) {
if (isset($new_array[$i])) {
$new_array[$i][$key] = $subval;
} else {
$new_array[$i] = array($key => $subval);
}
}
}
}