Display a simple map in PHP

[Camden Daily]

Try using mapscript's error reporting to find out what's going wrong.

At the beginning of your script, put:
  ms_ResetErrorList();

Then, at the end of the script, put this code:
  $error = ms_GetErrorObj();
  while($error AND $error->code != MS_NOERR) {
    printf("Error in %s: %s<br>\n", $error->routine, $error->message);
    $error = $error->next();
  }

That may get you started with debugging.