3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = Array ( '0' => Array ( 'created_at' => 1991, 'updated_at' => 1992, 'customer_name' => 'john doe', 'line_items' => Array ( '0' => Array ( 'name' => 'Hello world poduct', 'price' => 800.00, 'id' => 123, 'quantity' => 2 ), '1' => Array ( 'name' => 'Hello world product 2', 'price' => 100.00, 'id' => 456, 'quantity' => 1 ) ) ), '1' => Array ( 'created_at' => 1992, 'updated_at' => 1993, 'customer_name' => 'Guido van Rossum', 'line_items' => Array ( '0' => Array ( 'name' => 'Hello world product', 'price' => 800.00, 'id' => 123, 'quantity' => 2 ), '1' => Array ( 'name' => 'Hello world poduct 2', 'price' => 100.00, 'id' => 456, 'quantity' => 3 ), '2' => Array ( 'name' => 'Hello world poduct 3', 'price' => 400.00, 'id' => 116, 'quantity' => 5 ) ) ) ); var_export( array_column( array_merge( ...array_column($array,'line_items') ), 'quantity' ) );
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => 2, 1 => 1, 2 => 2, 3 => 3, 4 => 5, )

preferences:
73.96 ms | 406 KiB | 5 Q