check this code , guess you want to single array result
check array_reduce ()
built in function
<?php
$your_array = array(0 => array('item_id' => 3160), 1 => array('item_id' => 13123), 2 => array('item_id' => 234234), 3 => array('item_id' => 2123));
echo "<pre>";
print_r($your_array);
$convert_array = array_map('intval', array_column($your_array, 'item_id'));
echo "<pre>";
print_r($convert_array);
then your original Array :
Array
(
[0] => Array
(
[item_id] => 3160
)
[1] => Array
(
[item_id] => 13123
)
[2] => Array
(
[item_id] => 234234
)
[3] => Array
(
[item_id] => 2123
)
)
and output :
Array
(
[0] => 3160
[1] => 13123
[2] => 234234
[3] => 2123
)
solved Array Formation – PHP