抱歉，我读了很多文章使这很有意义，最终使我感到困惑！
我有2个数组：
阵列1：
Array (
[0] => Array ( [ID] => SI012348 [Date] => 06/01/2016 [Month] => 1 [Tier1] => 2.188875 [Tier2] => [Tier3] => [Tier4] => [Delivery] => 0 )
[1] => Array ( [ID] => SI012351 [Date] => 06/01/2016 [Month] => 1 [Tier1] => 2.139 [Tier2] => 0 [Tier3] => 0 [Tier4] => 0 [Delivery] => 0 )
[2] => Array ( [ID] => SI012387 [Date] => 14/01/2016 [Month] => 1 [Tier1] => 0.201 [Tier2] => 0 [Tier3] => 0 [Tier4] => 0 [Delivery] => 0 )
)
阵列2 ：（包含所有带有送货费用的发票）
Array (
[SI000005] => 25
[SI000010] => 15
[SI000054] => 20
[SI000069] => 0
[SI000074] => 20
[SI000076] => 16
)
我需要更新SI00000x匹配的数组1，并将值从数组2推入数组1中的[Delivery]值。
我敢肯定这很简单，但是我尝试的任何方法都会花费很多时间甚至崩溃！
请帮忙！
您可以使用此代码（请注意＆符号）：
foreach ($arr1 as &$rec) {
if (isset($arr2[$rec['ID']])) $rec['Delivery'] = $arr2[$rec['ID']];
}
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