$id = "12;13;43;412;232;2323;232;32;2;4;5;6"; 
$parcala = split(';', $id);
print_r($parcala);

/*
--- çıktı
Array
(
    [0] => 12
    [1] => 13
    [2] => 43
    [3] => 412
    [4] => 232
    [5] => 2323
    [6] => 232
    [7] => 32
    [8] => 2
    [9] => 4
    [10] => 5
    [11] => 6
)
*
/