array conversion

Hello, the project is quit simple as it requires only 1 or 2 fuctions. The goal is to convert a flat parent-child array into another flat array like this Original Array ( [0] => Array ( [0] => categorycode [1] => categoryname [2] => parentcategorycode ) [1] => Array ( [0] => 1 [1] => Cavi [2] => 0 ) [2] => Array ( [0] => 2 [1] => Cavi Computer [2] => 1 ) [3] => Array ( [0] => 3 [1] => Cavi Seriali e Paralleli [2] => 2 ) [4] => Array ( [0] => 4 [1] => Ufficio [2] => 0 ) [5] => Array ( [0] => 5 [1] => Manutenzione [2] => 4 ) [6] => Array ( [0] => 6 [1] => Valigette attrezzi per reti [2] => 5 ) [7] => Array ( [0] => 7 [1] => Accessori [2] => 0 ) [8] => Array ( [0] => 8 [1] => Manutenzione [2] => 7 ) [9] => Array ( [0] => 9 [1] => Valigette attrezzi per reti [2] => 8 ) [10] => Array ( [0] => 10 [1] => Networking [2] => 0 ) [11] => Array ( [0] => 11 [1] => Componenti passivi [2] => 10 ) ..... flat array as result array( [1] => Cavi [2] => Cavi/Cavi Computer [3] => Cavi/Cavi Computer/Cavi Seriali e Paralleli [4] => Ufficio [5] => Ufficio/Manutenzione [6] => Ufficio/Manutenzione/Valigette attrezzi per reti ... )