How can I split a string in PHP at the nth occurrence of a needle?

Question

There must be a fast and efficient way to split a (text) string at the "nth" occurrence of a needle, but I cannot find it. There is a fairly full set of functions

Answer 1

Taking Matthew's answer and adding a solution for Dɑvïd's comment:

function split_nth($str, $delim, $n) {
  $result = array_map(function($p) use ($delim) {
      return implode($delim, $p);
  }, array_chunk(explode($delim, $str), $n));
  $result_before_split = array_shift($result);
  $result_after_split = implode(" ", $result); 
  return array($result_before_split, $result_after_split);
}

Just call it by:

list($split_before, $split_after) = split_nth("1 2 3 4 5 6", " ", 2);

Output:

1 2
3 4 5 6