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,则会收到错误消息“&”不是预期的。我是否需要放弃 foreach ($arr as list ()) 语法并恢复到标准 for 循环并使用计数器变量进行访问?
foreach ($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($stmt);
}
}
编辑:更新的代码,我实际上需要修改 transactions 数组中每个数组的前两个子元素。
为什么不能用这种方式来做呢?假设键与列表变量相同
foreach ($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);
}
}
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