Convert multidimensional array into single array

Question

I have an array which is multidimensional for no reason

/* This is how my array is currently */ Array ( [0] => Array     (         [0] => Array             (                 [plan] => basic             )          [1] => Array             (                 [plan] => small             )          [2] => Array             (                 [plan] => novice             )          [3] => Array             (                 [plan] => professional             )          [4] => Array             (                 [plan] => master             )          [5] => Array             (                 [plan] => promo             )          [6] => Array             (                 [plan] => newplan             )      )   ) 

I want to convert this array into this form

/*Now, I want to simply it down to this*/ Array ( [0] => basic [1] => small [2] => novice [3] => professional [4] => master [5] => promo [6] => newplan ) 

Any idea how to do this?

Answer 1

This single line would do that:

$array = array_column($array, 'plan'); 

The first argument is an array | The second argument is an array key.

For details, go to official documentation: https://www.php.net/manual/en/function.array-column.php.

Answer 2

Assuming this array may or may not be redundantly nested and you're unsure of how deep it goes, this should flatten it for you:

function array_flatten($array) {    if (!is_array($array)) {      return FALSE;    }    $result = array();    foreach ($array as $key => $value) {      if (is_array($value)) {        $result = array_merge($result, array_flatten($value));      }      else {        $result[$key] = $value;      }    }    return $result;  }