Online PHP editor | output for uhGlk

<?php $array = array ( 0 => array ( ) , 1 => array ( 'wpcf-fields-checkboxes-option-1a38bb558a59802a54ebd4b27c91431e-1' => Array ( 0 => 'Attacco rapido' ) , 'wpcf-fields-checkboxes-option-0ad0b877a16a24fc4958374f171ef112-1' => Array ( 0 => 'Bordo bianco' ) ) , 2 => array ( 'wpcf-fields-checkboxes-option-1a38bb558a59802a54ebd4b27c91431e-1' => Array ( 0 => 'Attacco rapido' ) , 'wpcf-fields-checkboxes-option-3b2241533b2c56891d3fd57718409b85-1' => Array ( 0 => 'Supporti regolabili' ) ) ); array_walk_recursive($array, function ($value, $key) use (&$list) { $list[] = $value; }); print_r($list);