Here is an example of what I am trying to do:
If you really need to know what file the current one has been included from - this is the solution:
$trace = debug_backtrace();
$from_index = false;
if (isset($trace[0])) {
$file = basename($trace[0]['file']);
if ($file == 'index.php') {
$from_index = true;
}
}
if ($from_index) {
// Do something
} else {
// Do something else
}