将数组中的数组移动到父数组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);