Merge array values in a single array by removing duplicates and null values in PHP

Question

I have an array like this:

Array
(
    [0] => Array
        (
             [0] => Array
                (
                    [id] => 1234
                    [name] => John
                )

             [1] => Array
                (

                )
        )

    [1] => Array
        (
            [0] => Array
                (
                    [id] => 1234
                    [name] => John
                )

            [1] => Array
                (
                    [id] => 5678
                    [name] => Sally
                )
            [2] => Array
                (
                    [id] => 1234
                    [name] => Duke
                )
)

My resulting array should be the following (basically merging and getting rid of duplicates and removing null values):

Array
(
    [0] => Array
        (
           [id] => 1234
           [name] => John
        )

    [1] => Array
        (
           [id] => 5678
           [name] => Sally
        )
    [2] => Array
        (
           [id] => 1234
           [name] => Duke
        )
)

Is there an easy way to do this using PHP's array functions?

EDIT: So far I have this:

$result = array();
      foreach ($array as $key => $value) {
        if (is_array($value)) {
          $result = array_merge($result, $value);
        }
      }
print_r($result);

Have you looked or thought about any way to do this?

tbddeveloper
– tbddeveloper

2014-08-22 17:08:29 +00:00
Commented Aug 22, 2014 at 17:08 — tbddeveloper
– tbddeveloper, Commented Aug 22, 2014 at 17:08
added a possible solution

Jake
– Jake

2014-08-22 17:23:13 +00:00
Commented Aug 22, 2014 at 17:23 — Jake
– Jake, Commented Aug 22, 2014 at 17:23
You have 3 dimensional arrays always?

revo
– revo

2014-08-22 17:23:58 +00:00
Commented Aug 22, 2014 at 17:23 — revo
– revo, Commented Aug 22, 2014 at 17:23

Ian · Accepted Answer · 2014-08-22 17:25:26Z

1

Use array_merge to merge the arrays. Then use array_unique to remove duplicates. Finally, to remove null keys, use a loop.

foreach($array as $key=>$value)
{
    if(is_null($value) || $value == '')
        unset($array[$key]);
}

Documentation on these methods can be found here.

answered Aug 22, 2014 at 17:25

Ian

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2 Comments

Jake Over a year ago

How do I remove duplicates in an array with associative key value pairs?

Ian Over a year ago

Duplicate keys or duplicate keys with duplicate values?

mickmackusa · Accepted Answer · 2020-08-18 11:33:27Z

0

Flatten your unnecessarily depth array structure by unpacking the subarrays into a merge call.
Filter out the empty subarrays with array_filter().
Remove the duplicate subarrays with array_unique(). (SORT_REGULAR prevents "Warning: Array to string conversion")

Code: (Demo)

var_export(
    array_unique(
        array_filter(
            array_merge(...$array)
        ),
        SORT_REGULAR
    )
);

Optionally, call array_values() on the resultant array to re-index it (remove the old keys).

answered Aug 18, 2020 at 11:33

mickmackusa♦

49.2k13 gold badges98 silver badges165 bronze badges

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