How can i take an array, divide it by two and create two lists?

Use array_chunk to split the array up into multiple sub-arrays, and then loop over each.

To find out how large the chunks should be to divide the array in half, use ceil(count($array) / 2).

<?php
$input_array = array('a', 'b', 'c', 'd', 'e', 'f');
$arrays = array_chunk($input_array, 3);

foreach ($arrays as $array_num => $array) {
  echo "Array $array_num:\n";
  foreach ($array as $item_num => $item) {
    echo "  Item $item_num: $item\n";
  }
}

Output

Array 0:
  Item 0: a
  Item 1: b
  Item 2: c
Array 1:
  Item 0: d
  Item 1: e
  Item 2: f

To get a part of an array, you can use array_slice:

$input = array("a", "b", "c", "d", "e");

$len = (int) count($input);

$firsthalf = array_slice($input, 0, $len / 2);
$secondhalf = array_slice($input, $len / 2);