dsj8086 2016-08-19 09:25
浏览 186
已采纳

在foreach PHP中进行几次迭代后,从第一个开始循环

For example, I have 7 channels and 4 groups. This should be distributed in the following way:

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 

How can I distribute in This way?

I used forloop as following

$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
        )

)

Now,

I am having a query

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

For 4 iterations it is working fine, from 5th iteration I am getting an error:
Undefined offset: 4
How do I solve this problem?
After four iteration The loop should start from first.

  • 写回答

1条回答 默认 最新

  • dongshang1979 2016-08-19 09:37
    关注

    Update: You will have to use an external variable to keep track of the current index of the group element being accessed and reset it to zero when it has gotten to the end of the group.

    Is this what you are looking for?

    $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"]."
    "; // print out the channel and the group id
    
       $group_id ++;
    
       if($group_id > 0 && $group_id % (count($groups)) == 0)
           $group_id = 0;
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥15 商城生产日期批次库存问题
  • ¥15 esp8266控制共阳极wrgb灯板无法关闭所有led灯
  • ¥100 python读取速度问题
  • ¥15 stm32f407使用DMA问题
  • ¥15 您好 这个API接口该怎么弄 网站搭建好了 API也有 现在就不知道该怎么填写API 不知道怎么用
  • ¥88 用uniapp写一个多端的程序,用到高德地图,用高德的JSAPI吗?
  • ¥20 关于#c++#的问题:水果店管理系统
  • ¥30 dbLinq最新版linq sqlite
  • ¥20 对D盘进行分盘之前没有将visual studio2022卸载掉,现在该如何下载回来
  • ¥15 完成虚拟机环境配置,还有安装kettle