<?php

$path = "Some.Stuff.Articles.is_visible";
$arr = explode('.', $path);
$partCount = count($arr);
if ($partCount-1 > 1)
    $out = $arr[$partCount - 2] . '.' . $arr[$partCount - 1];
else if ($partCount-1 === 1)
    $out = $arr[$partCount - 1];
else
  $out = $arr[0];

echo $out;

?>