Move array in array to parent array php - php

Question

Is there a specific function to move array which is in array to the parent array as key or value.
array(5) { [0]=> array(1) { [0]=> string(2) "id" } [1]=> array(1) { [0]=> string(7)
"buydate" } [2]=> array(1) { [0]=> string(6) "expire" } [3]=> array(1) { [0]=> string(6)
"planid" } [4]=> array(1) { [0]=> string(5) "buyer" } }
Result I would like to get is:
array() { [0] => 'id', [1] => 'buydate' etc. }
Or
array('id', 'buydate' etc.. )
Is it possible to achieve without foreach ?

Answer 1

array_map() is extremely powerful and should do the trick:
$array = ... ; // your initial array
$flattened_array = array_map(function($item) {
return $item[0];
}, $array);

Answer 2

If you want to flatten the desired array, and use foreach you can do it this way.
Consider this example:
// Sample data:
$values = array(
0 => array(
0 => 'id',
),
1 => array(
0 => 'buydate',
),
2 => array(
0 => 'expire',
),
3 => array(
0 => 'planid',
),
4 => array(
0 => 'buyer',
),
);
$new_values = array();
foreach($values as $key => $value) {
$new_values[] = $value[0];
}
print_r($new_values);
Sample Output:
Array
(
[0] => id
[1] => buydate
[2] => expire
[3] => planid
[4] => buyer
)
Or alternatively, you can you the iterator. Consider this example:
$new_values = array();
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($values));
foreach($iterator as $value) {
$new_values[] = $value;
}
It should gave you the same output.