Php get specific array in a multidimensional array

Question

I'm looking for a solution to get an array from a multidimensional array

For example; This is my array:

I'd like to get the array where the id equals 1

So in this example, where [id] => 1 I would like to capture the entire array of id 1, thus:

Array
                (
                    [0] => Array
                        (
                            [id] => 1
                            [name] => Erwin Dubois
                            [text] => Erwin Dubois
                            [parent_id] => 2
                            [href] => http://google.com
                            [nodes] => Array
                                (
                                    [0] => Array
                                        (
                                            [id] => 3
                                            [name] => Test Gebruiker
                                            [text] => Test Gebruiker
                                            [parent_id] => 1
                                            [href] => http://google.com
                                        )

                                    [1] => Array
                                        (
                                            [id] => 4
                                            [name] => Catharina
                                            [text] => Catharina
                                            [parent_id] => 1
                                            [href] => http://google.com
                                        )

                                )

                        )

Is there a way in php where I can have a function like;

function get_subarray($id) {
  // Select array where id = $id
}

Any point towards the direction is greatly appreciated! It would be needed into a function since I would parse different userlevels depending on their unique id

array:

$json = file_get_contents("https://innerbeauthe.be/cp/_data/fetch.php");
$data = json_decode($json,true);

Michael Berkowski · Accepted Answer

You can define a recursive function which traverses the array in search of the desired array key.

Although PHP includes a function array_walk_recursive(), it will traverse into leaf nodes and makes it difficult to return a parent array. Likewise, using RecursiveArrayIterator actually complicates getting at the array you want instead of the leaf notes. Instead it is not too complicated to create your own:

// Function accepts an array and a search value
function walk_for_array(array $a, $search) {
  // Loop over the array
  foreach ($a as $k => $v) {
    // Find sub-arrays (rather than scalar values)
    if (is_array($v)) {
      // Check if there is an 'id' key and if it matches your search value
      if (isset($v['id']) && $v['id'] == $search) {                                                                                           
        // return it
        return $v; 
      }   
      else {
        // Otherwise continue drilling into the array for more arrays
        $sub = walk_for_array($v, $search);
        // Return the recursive value only if the inner call
        // was non-null
        if ($sub) return $sub;
      }   
    }   
  }
}

// Call it, searching for id == 1
$found = walk_for_array($your_big_array, 1);

print_r($found);

// Call it, searching for id == 13
$found = walk_for_array($your_big_array, 13);

print_r($found);

Prints:

Array
(
    [id] => 1
    [name] => Erwin Dubois
    [text] => Erwin Dubois
    [parent_id] => 2
    [href] => http://google.com
    [nodes] => Array
        (
            [0] => Array
                (
                    [id] => 3
                    [name] => Test Gebruiker
                    [text] => Test Gebruiker
                    [parent_id] => 1
                    [href] => http://google.com
                )

            [1] => Array
                (
                    [id] => 4
                    [name] => Catharina
                    [text] => Catharina
                    [parent_id] => 1
                    [href] => http://google.com
                )

        )

)

And for id = 13

Array
(
    [id] => 13
    [name] => Macy VanMaele
    [text] => Macy VanMaele
    [parent_id] => 6
    [href] => http://google.com
)

Php get specific array in a multidimensional array

Answers (1)

Prints:

And for id = 13

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