拆分数组并添加到组

Question

I have the following array which consists of simply integers (IDs) within 8 sub arrays. I have 8 groups, and I need the integers from array 1 to go into the first group, array 2 into the second and so on. I intent to use sql inserts to achieve this.

My data is as follows:

Array
(
    [0] => Array
        (
            [0] => 4012
            [1] => 3914
            [2] => 4054
            [3] => 3911
            [4] => 4010
            [5] => 3979
        )

    [1] => Array
        (
            [0] => 3916
            [1] => 3946
            [2] => 4059
            [3] => 3924
            [4] => 4018
            [5] => 3967
        )

    [2] => Array
        (
            [0] => 3983
            [1] => 4057
            [2] => 3980
            [3] => 3901
            [4] => 4045
            [5] => 3955
        )

    [3] => Array
        (
            [0] => 3908
            [1] => 3898
            [2] => 3939
            [3] => 4036
            [4] => 4079
            [5] => 3479
        )

    [4] => Array
        (
            [0] => 3995
            [1] => 3910
            [2] => 4047
            [3] => 3988
            [4] => 3965
            [5] => 4080
        )

    [5] => Array
        (
            [0] => 3925
            [1] => 3561
            [2] => 4000
            [3] => 4061
            [4] => 3950
            [5] => 4058
        )

    [6] => Array
        (
            [0] => 3989
            [1] => 3964
            [2] => 3904
            [3] => 4070
            [4] => 3954
            [5] => 3984
        )

    [7] => Array
        (
            [0] => 3985
            [1] => 4044
            [2] => 4062
            [3] => 4014
            [4] => 3899
        )

)

The groups I have are:

• Group 01a
• Group 01b
• Group 02a
• Group 02b
• Group 03a
• Group 03b
• Group 04a
• Group 04b

The php I am running works well in that it creates the name of the groups as above, however the foreach which handles the smallgroups array does not work. It duplicates the smallusers 8 times, when I want to have just the first sub array for processing in the loop, then then next.

$count = 0;
foreach ($biggroup as $key => $users) {
    $smallgroups = array_chunk($users, ceil(count($users) / 8));
    for ($i = 1; $i <= 4; $i++) {
    $groupnum = sprintf("%02d", $count * 4 + $i);
        foreach (range('a', 'b') as $letter) {
            $nameofgroup = 'Group ' . $groupnum . $letter;
            foreach ($smallgroups as $f => $smallusers) {
            }
        }
    }
}
$count++;

I expect the following:

Group 01A 4012, 3914, 4054, 911, 4010, 3979

Group 01B 3916, 3946, 4059, 3924, 4018, 3967

etc

Answer 1

array_walk() - Apply a user supplied function to every member of an array

You can use array_walk, Here $arr is the original array

$groups = ['01a','01b','02a','02b','03a','03b','04a','04b'];
$res = [];
array_walk($arr, function($v, $k) use ($groups, &$res){
   $res[$groups[$k]] = $v;
});
echo '<pre>';
print_r($res);

Output:-

 Array
(
[01a] => Array
    (
        [0] => 4012
        [1] => 3914
        [2] => 4054
        [3] => 3911
        [4] => 4010
        [5] => 3979
    )

[01b] => Array
    (
        [0] => 3916
        [1] => 3946
        [2] => 4059
        [3] => 3924
        [4] => 4018
        [5] => 3967
    )
    ........
    ........
    ........

array_combine() - Creates an array by using one array for keys and another for its values

I am using a few array values and keys for demonstration

$arr = Array
(
  0 => Array
    (
        0 => 4012,
        1 => 3914
    ),

  1 => Array
    (
        0 => 3916,
        1 => 3946
    ),

  2 => Array
    (
        0 => 3983,
        1 => 4057
    ),

  3 => Array
    (
        0 => 3908,
        1 => 3898
    ),

  4 => Array
    (
        0 => 3995,
        1 => 3910
    )

);
$groups = ['01a','01b','02a','02b','03a'];
$res = array_combine($groups, $arr);
echo '<pre>';
print_r($res);