How to split/divide an array into 2 using php?

Use array_chunk:

$pieces = array_chunk($array, ceil(count($array) / 2));

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If you want them in separate variables (instead of a multi-dimensional array), use list:

list($array1, $array2) = array_chunk($array, ceil(count($array) / 2));

array_slice works well as long as you know how many elements you want in each array:

$array1 = array_slice($array, 0, 3);
$array2 = array_slice($array, 3, 3);