Online PHP editor | refs for O0BmK

<?php $a = [0,1,2,3,4,[10,20,30]]; $nu_array = null; $callback = function ( $item ) use(&$callback, &$nu_array) { if (!is_array($item)) { $nu_array[] = $item; } else if ( is_array( $item ) ) { foreach( array_values($item) as $v) { if ( !(is_array($v))) { $nu_array[] = $v; } else { $callback( $v ); continue; } } } }; array_walk($a, $callback); print_r($nu_array); $b = []; array_walk_recursive($a, function ( $item ) use(&$b ) { $b[] = $item; } ); print_r($b);