php array slice
// array_slice($array, $offset, $length)
$array = array(1,2,3,4,5,6);
// positive $offset: an offset from the begining of array
print_r(array_slice($array, 2)); // [3,4,5,6]
// negative $offset: an offset from the end of array
print_r(array_slice($array, -2)); // [5,6]
// positive $length: the slicing will stop $length elements
// from offset
print_r(array_slice($array, 2, 3)); // [3,4,5]
// negative $length: the slicing will stop $length elements
// from the end of array
print_r(array_slice($array, 2, -3)); // [3]