Write a function named contains that accepts two arrays of integers $a1 and $a2
as parameters and that returns a value indicating whether or not $a2's sequence of elements appears
in $a1 (true for yes, false for no). The sequence of elements in $a2 may
appear anywhere in $a1 but must appear consecutively and in the same order.
For example, if variables called $a1 and $a2 store the following values:
$a1 = [1, 6, 2, 1, 4, 1, 2, 1, 8];
$a2 = [1, 2, 1];
Then the call of contains($a1, $a2) should return true because $a2's sequence
of values [1, 2, 1] is contained in $a1 starting at index 5. If $a2
had stored the values [2, 1, 2], the call of contains($a1, $a2) would return false
because $a1 does not contain that sequence of values. Any two arrays with identical elements are considered to
contain each other, so a call such as contains($a1, $a1) should return true.
Constraints:
- You may assume that both arrays passed to your function will have lengths of at least 1.
- You may not modify either of the passed arrays.
- You may not use any
Strings to help you solve this problem, nor functions that
produce Strings.
