PHP-按数字范围将多维数组排序为另一个数组

Question

I have a multidimensional array that I get from DB. Array has a number of views by each hour that is logged in the DB as a view, and it looks like this:

array:11 [▼
    0 => array:2 [▼
         "hour" => 0
         "views" => 1
         ]
    1 => array:2 [▼
         "hour" => 1
         "views" => 1
         ]
    2 => array:2 [▼
         "hour" => 4
         "views" => 1
         ]
    ...and so on
    ]

I need to make a new array that will contain number of views for range of 2 hours. So for example from the array shown above I would like to get an array with, number of views for time between 0-2, that would 2, and for 2-4, would be 0 in this case, and so on.

Answer 1

You can do it in Mysql query:

select floor(hour/2) range, sum(views) sum 
   from thetable 
 group by range

Answer 2

You can just use a foreach to create a new array.

<?php


$your_array = [0 => [
         "hour" => 0,
         "views" => 4
         ],
    1 => [
         "hour" => 1,
         "views" => 12
         ],
    2 => [
         "hour" => 4,
         "views" => 1
         ],
    3 => [
         "hour" => 2,
         "views" => 9
         ],
    4 => [
         "hour" => 21,
         "views" => 19
         ]
         ];   



foreach ($your_array as $value){
    for($i=0;$i<=22;$i=$i+2){
    $j=$i+2;
    if($value['hour']>=$i && $value['hour']<$j){
        isset($result[$i.'-'.$j])?$result[$i.'-'.$j]+=$value['views']:$result[$i.'-'.$j]=$value['views'];
    }
    }
}

print_r($result);

Answer 3

Try below code.

$arr = [0 => [
         "hour" => 0,
         "views" => 1
         ],
    1 => [
         "hour" => 1,
         "views" => 1
         ],
    2 => [
         "hour" => 4,
         "views" => 1
         ]];    

foreach($arr as $row)
{
    if($row['hour'] >= 0 && $row['hour'] <= 2)
    {
        $newArr['0-2'] = isset($newArr['0-2']) ? ($newArr['0-2'] + 1) : 1;
    }
    if($row['hour'] > 2 && $row['hour'] < 4)
    {
        $newArr['2-4'] = isset($newArr['2-4']) ? ($newArr['2-4'] + 1) : 1;
    }
}
print_r($newArr);

Output

Array
(
    [0-2] => 2
)