Recursive function to move a specific key in a multidimensional array to the bottom of his level

Question

I'm looking for a php (sort?)function which move a specific key ('current_files') to the bottom of its array level.

I have sth like that:

[A] => [
     [current_files] => [
           [0] => ...
           [1] => ...  
     ]
     [D] => [
          [G] => [...]   
          [current_files] => [...]
          [B] => [...]
     ]
]
[current_files] => [...]
[K] => [...]

I need this:

[A] => [
     [D] => [
          [G] => [...]   
          [B] => [...]
          [current_files] => [...]
     ]
     [current_files] => [
           [0] => ...
           [1] => ...  
     ]
]
[K] => [...]
[current_files] => [...]

I know that i need a recursive function like arr_multisort but i dont understand it -_-

you mean a built-in function that does your special business logic for your sorting? obviously there is none, figure it out first on how would you sort your array (the criteria) and start coding — Kevin
– Kevin, Commented Jun 1, 2018 at 8:25
@Andreas that could be asked of 75% of Stack overflow questions. — Philip Couling
– Philip Couling, Commented Jun 1, 2018 at 8:32
@PhilipCouling Yes. And most of the times there is no good reason, and you help OP with finding a much more optimized solution — Andreas
– Andreas, Commented Jun 1, 2018 at 8:35

Pradeep · Accepted Answer · 2018-06-03 09:07:25Z

1

Try this

Written a common function just call that function to move down any key by passing the specific key as argument.

function sortArrayByKey(&$array, $search_key) {
    $searched_key_arr = array();
    foreach ($array as $k => &$values) {
        if (array_key_exists($search_key, $values)) {
            sortArrayByKey($values, $search_key);
        } else if ($k == $search_key) {
            $searched_key_arr[$k] = $values;
            unset($array[$k]);
        }
    }
    if (!empty($searched_key_arr)) {
        foreach ($searched_key_arr as $key => $val) {
            $array[$key] = $val;
        }
    }
    return $array;
}

$arr = $this->sortArrayByKey($data, 'current_files'); //$data is your input array
print_r($arr);

edited Jun 3, 2018 at 9:07

Pradeep

9,70713 gold badges29 silver badges34 bronze badges

answered Jun 1, 2018 at 9:00

Annapurna Agarwal

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Comments

ᴄʀᴏᴢᴇᴛ · Accepted Answer · 2018-06-01 08:35:17Z

1

The easiest method is to remove the key from the original array and push it to the end.

like this :

$keyToMove = 'current_files';
if (array_key_exists($keyToMove, $arrayToSort)) {
    $tmp = $arrayToSort[$keyToMove]; // extract the key to move
    unset($arrayToSort[$keyToMove]); // unset the key from the array
    $arrayToSort[$keyToMove] = $tmp; // add the saved data in the end
}

Then if you have a multidimentionnal array to "sort" you will have to run this recursively.

answered Jun 1, 2018 at 8:35

ᴄʀᴏᴢᴇᴛ

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Comments

Michael Beeson · Accepted Answer · 2018-06-01 08:43:53Z

Well seeing as you already know the key of the item you want to move, things can be pretty simple with a recursive function. You use the '&' simple to pass the array in as reference.

function moveCurrentFiles(&$array) {
    //first move current_files to the end of the array
    if (isset($array["current_files"])) {
        $currentFiles = $array["current_files"];
        //unset then reset value to "move" it to the end
        unset($array["current_files"]);
        $array["current_files"] = $currentFiles;
    }

    //loop through array items to check if any of them are arrays
    foreach($array as &$value) {
         if (is_array($value)) {
             //recursively call this function on that array
             moveCurrentFiles($value);
         }
    }
}

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