Laravel - Remove elements having NULL value from multidimentional array

Question

I am using Laravel 5.3.

I have a multidimensional array like:

And I want to remove the elements that are NULL. So the result should be like:

Array
(
    [id] => 37141
    [last_done_on] => []
    [children] => Array
        (
            [0] => Array
                (
                    [id] => 37142
                    [last_done_on] => Array()
                    [children] => Array()
                )

            [1] => Array
                (
                    [id] => 37143
                    [last_done_on] => Array()
                    [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 37144
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                            [1] => Array
                                (
                                    [id] => 37145
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                        )
                )
            [2] => Array
                (
                    [id] => 37157
                    [last_done_on] => Array()
                    [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 37158
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                            [1] => Array
                                (
                                    [id] => 37159
                                    [last_done_on] => Array()
                                    [children] => Array
                                        (
                                        )
                                )
                        )
                )
        )
)

How to do this?

This is the thing that annoys me about frameworks, it causes people to overlook the functionality that the underlying programming language provides. You don't need any fancy "web artisan" nonsense, just PHP's array_filter() function and a working knowledge of recursion. — GordonM
– GordonM, Commented Mar 16, 2017 at 10:06

linktoahref · Accepted Answer · 2017-11-23 13:16:11Z

11

In collection, use filter

some_collection->filter(function($value, $key) {
    return  $value != null;
});

edited Nov 23, 2017 at 13:16

linktoahref

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answered Sep 12, 2017 at 5:43

Ganesh K

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1 Comment

Yevgeniy Afanasyev Over a year ago

Good idea, but it does not answering the question about multidimensional array. For flat array it is fine.

Rwd · Accepted Answer · 2017-03-16 09:35:05Z

7

If you want to remove the null values but not the empty arrays you could do something like:

function array_remove_null($item)
{
    if (!is_array($item)) {
        return $item;
    }

   return collect($item)
        ->reject(function ($item) {
            return is_null($item);
        })
        ->flatMap(function ($item, $key) {

            return is_numeric($key)
                ? [array_remove_null($item)]
                : [$key => array_remove_null($item)];
        })
        ->toArray();
}

$newArray = array_remove_null($array);

Hope this helps!

edited Mar 16, 2017 at 9:35

answered Mar 16, 2017 at 9:16

Rwd

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2 Comments

Dev Over a year ago

Seems working!! but I also want to reorder the keys. For example by removing element that is having NULL value from 0th position, the next element should become 0th.

Rwd Over a year ago

@Dev I've updated my answer to include a way to reset numeric keys.

Moode Osman · Accepted Answer · 2022-12-16 12:21:42Z

4

There are 2 options to use:

$yourArr = array_map('array_filter', $yourArr);

or

$yourArr = array_filter( $yourArr);

all keys with a null value will be eliminated

edited Dec 16, 2022 at 12:21

Moode Osman

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answered Mar 16, 2017 at 8:56

Onix

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2 Comments

G S Bajaj Over a year ago

@Dev Just this line should do $yourArr= array_filter( $yourArr); See example #2 here secure.php.net/manual/en/function.array-filter.php In your case the array you want to clear up is having the key 'children', so the exact line would be $arr = array_filter($arr['children']);

Dev Over a year ago

@GSBajaj might be you're not getting my question.

dparoli · Accepted Answer · 2017-03-16 09:25:22Z

3

Try this:

   function array_filter_recursive($input) 
   { 
      foreach ($input as &$value) 
      { 
           if (is_array($value)) 
           { 
               $value = array_filter_recursive($value); 
           } 
      }     
      return array_filter($input, function($var){return !is_null($var);} ); 
   }

edited Mar 16, 2017 at 9:25

answered Mar 16, 2017 at 8:59

dparoli

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2 Comments

Dev Over a year ago

It removes all the elements that are empty. I don't want to remove the keys children or last_done_on even if they are empty. Also it disturbs the keys of the array.

dparoli Over a year ago

Edited to remove only null values

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