循环的迭代应该产生16个名字而不是4个

Question

I have the loop below which iterates 4 times. Within this look is another which defines my group names. I would like to produce the output

Group 01
Group 02
Group 03
....
Group 15
Group 16

instead of what I currently get

Group 01
Group 02
Group 03
Group 04
Group 01
Group 02
Group 03
Group 04 
Group 01
Group 02
Group 03
Group 04
Group 01
Group 02
Group 03
Group 04

Code

foreach ($largegroups as $key => $users) { // loops 4 times
    for ($i = 1; $i <= 4; $i++) {
        $num = sprintf("%02d", $i);
        $groupname = 'Group ' . $num;
    }
}

Answer 1

You need to add a counter to the outer loop, and multiply that by 4 before adding $i to get the group number. For example:

$g = 0;
foreach ($largegroups as $key => $users) { // loops 4 times
    for ($i = 1; $i <= 4; $i++) {
        $num = sprintf("%02d", $g * 4 + $i);
        $groupname = 'Group ' . $num;
    }
    $g++;
}