How to find the second-to-last occurrence of a character within a string?

Question

If possible, using only standard PHP functions like substr(), strrpos(), strpos(), etc.

Answer 1

First, find the last position:

$last = strrpos($haystack, $needle);
if ($last === false) {
  return false;
}

From there, find the 2nd last:

$next_to_last = strrpos($haystack, $needle, $last - strlen($haystack) - 1);