在 foreach PHP 中经过几次迭代后从第一个开始循环

Question

例如，我有 7 个频道和 4 个组。这应该按以下方式分发：

Channel 1 - Group 1
Channel 2 - Group 2
Channel 3 - Group 3
Channel 4 - Group 4
Channel 5 - Group 1
Channel 6 - Group 2
Channel 7 - Group 3 

我怎样才能以这种方式分发？

我使用forloop如下

$groups = //array outputs the following
Array
(
    [0] => Array
        (
            [id] => 10
            [email] => susannec@methodfuel.com
        )

    [1] => Array
        (
            [id] => 17
            [email] => air@tel.com
        )

    [2] => Array
        (
            [id] => 34
            [email] => venu@methodfuel.com
        )

    [3] => Array
        (
            [id] => 62
            [email] => varadaraj999@gmail.com
        )

)

现在，

我有一个问题

foreach ($query as $key => $value) {
    $usrSql = "UPDATE issues SET user_id = ".$usersAssigned[$key]['id']." WHERE id =".$value['id'];
 // DB updating process
} 

4 次迭代它工作正常，从第 5 次迭代开始出现错误：
未定义的偏移量：4
我该如何解决这个问题？
四次迭代后循环应该从第一个开始。

Answer 1

更新：您将不得不使用外部变量来跟踪正在访问的组元素的当前索引，并在它到达组末尾时将其重置为零。

这是你要找的吗？

$channels = array("Channel 1", "Channel 2", "Channel 3", "Channel 4", "Channel 5", "Channel 6", "Channel 7");

$group_id = 0;
$groups = array( array("id"=>3, "email"=>"email_1"), array("id"=>10, "email"=>"email_2"), array("id"=>6, "email"=>"email_3"), array("id"=>71, "email"=>"email_4"));

foreach($channels as $channel)
{
   echo $channel." - Group ".$groups[$group_id]["id"]."\n"; // print out the channel and the group id

   $group_id ++;

   if($group_id > 0 && $group_id % (count($groups)) == 0)
       $group_id = 0;
}