Question

我必须使用钥匙，＆＃39; payment_date＆＃39;并且平衡了＃39;我有一个功能，检查＆＃39; payment_date＆＃39;看它是否＆lt; =＆＃39;今天＆＃39;，它有效，但现在我不知道如何取得平衡＆＃39;从那个：

function getCurrentBalance($myTable){
    $today = new DateTime('now');
    $today = $today->format('Y-m-d');
    foreach($myTable as $row) {
         foreach($row as $key=>$value) {
                 if ($key == "payment_date" && $value <= $today){

                 }
         }
     }
}

Answer 1

如果您已经知道所需的密钥，那么您真的不需要第二个循环。您可以直接访问它们。

function getCurrentBalance($myTable){
    $today = new DateTime('now');
    $today = $today->format('Y-m-d');
    foreach($myTable as $row) {
         if ($row['payment_date'] <= $today){
             //Do something with $row['balance']
         }
     }
}

Answer 2

这样做：

foreach($myTable as $row) 
{
    if ($row['payment_date'] <= $today)
    {
        echo $row['balance'];                        
    }
}

Answer 3

我不太清楚你想做什么，我认为你的答案是：

function getCurrentBalance($myTable){
    $today = new DateTime('now');
    $today = $today->format('Y-m-d');
    foreach($myTable as $row) {
        foreach($row as $key=>$value) {
            if ($key == "payment_date" && $value <= $today){
                $balance = $row['balance'];
                ...
            }
        }
    }
}

根据另一个key =＆gt;值的值获取数组键值=＆gt;的值？

3 个答案: