- array_column: documentation ( source)
- print_r: documentation ( source)
<?php
$array = [
['item' => ['name' => 'ttt', 'price' => 100, 'quantity' => 1]],
['item' => ['name' => 'sss', 'price' => 100, 'quantity' => 1]],
['item' => ['name' => 'vvv', 'price' => 100, 'quantity' => 1]],
];
print_r(array_column($array, 'item'));