PHP Split and combine array based on value of a key

Question

Here is the example array :

Array
(
    [0] => Array
        (
            [action] => move
            [para1] => h_1
            [para2] => loc_231
            [day] => day_1
        )

    [1] => Array
        (
            [action] => visit
            [para1] => poi_231
            [para2] => loc_231
            [day] => day_1

        )
     [2] => Array
        (
            [action] => visit
            [para1] => poi_231
            [para2] => loc_231
            [day] => day_2

        )
   )

I would like to split the array based on the value of key day and then combine them together.

The final array should look like:

    Array
    (
        Array(
         [0] => Array
            (
                [action] => move
                [para1] => h_1
                [para2] => loc_231
                [day] => day_1
            )

        [1] => Array
            (
                [action] => visit
                [para1] => poi_231
                [para2] => loc_231
                [day] => day_1

            )
       )
      Array(
        [0] => Array
            (
                [action] => visit
                [para1] => poi_231
                [para2] => loc_231
                [day] => day_2

            )
      )

 )

What is the better way other than iterating through the array? Is there any php function for that ?

I tried to loop the array but keeps getting array_push() expects parameter 1 to be array, null given — Priska Aprilia
– Priska Aprilia, Commented Oct 11, 2015 at 12:58

MrFreezer · Accepted Answer · 2015-10-11 12:57:55Z

You can do your own function

$data = array(array("action"=>"1","day"=>"day_2"),array("action"=>"2","day"=>"day_1"),array("action"=>"3","day"=>"day_1"),array("action"=>"4","day"=>"day_2"),array("action"=>"5","day"=>"day_1"));
print_r($data);
function split_on($array,$field)
{
    $ret = array();
    foreach($array as $arr)
    {
        $value_field = $arr[$field];
        $ret[$value_field][] = $arr;
    }
    return array_values($ret);
}
print_r(split_on($data,"day"));

Result:

Array
(
    [0] => Array
        (
            [action] => 1
            [day] => day_2
        )

    [1] => Array
        (
            [action] => 2
            [day] => day_1
        )

    [2] => Array
        (
            [action] => 3
            [day] => day_1
        )

    [3] => Array
        (
            [action] => 4
            [day] => day_2
        )

    [4] => Array
        (
            [action] => 5
            [day] => day_1
        )

)
Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [action] => 1
                    [day] => day_2
                )

            [1] => Array
                (
                    [action] => 4
                    [day] => day_2
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [action] => 2
                    [day] => day_1
                )

            [1] => Array
                (
                    [action] => 3
                    [day] => day_1
                )

            [2] => Array
                (
                    [action] => 5
                    [day] => day_1
                )

        )

)

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