Question

我试图修改多维数组的每个数组元素中第一个子元素的内容，但是，如果我通过引用传递所述元素，我会得到一个错误“＆amp;”不是预期的。我是否需要抛弃foreach（$ arr as list（））语法并恢复为循环标准并使用计数器变量进行访问？

foreach ($transactions as list(&$student, &$tyID)) {

    $query = "SELECT $column
              FROM student
              WHERE stUserID=$student";

    if ($stmt = mysqli_prepare($link, $query)) {
        mysqli_stmt_execute($stmt);

        mysqli_stmt_bind_result($stmt, $userHID);

        while (mysqli_stmt_fetch($stmt)) {
            $student = $userHID;
            $tyID = $transType[$tyID];
        }

        mysqli_stmt_close($stmt);
    }
}

编辑：更新了代码，我实际上需要修改Transactions数组中每个数组的前两个子元素。

Answer 1

为什么你不能这样做？假设密钥与列表变量相同

foreach ($transactions as &$transaction) {

    $query = "SELECT {$column}
              FROM student
              WHERE stUserID={$transaction['student']}";

    if ($stmt = mysqli_prepare($link, $query)) {
        mysqli_stmt_execute($stmt);

        mysqli_stmt_bind_result($stmt, $userHID);

        while (mysqli_stmt_fetch($stmt)) {
            $transaction['student'] = $userHID;
            $transaction['tyID'] = $transType[$transaction['tyID']];
        }

        mysqli_stmt_close($stmt);
    }
}

如何在foreach迭代中修改多维数组的子元素

1 个答案: