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<?php $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; } } } }; $array = array( 'a',array(1,2), 'b',array(3,4, array(5,6, array('c','d', array(7,8)))) ); array_walk($array, $callback); print_r($nu_array); /** Array ( ) **/

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