Help with Undefined Variable

I have a script referencing a variable, $updated_time, which throws the 
following error when run:


PHP Warning:  Undefined variable $updated_time in 
blahblahblah/mail_gallery_updates.php on line 60


Line 60 is the line in the script that defines $updated_time:


foreach ($shows as $showcode => $showname) {
     if (file_exists("$archive_dir/$showcode")) {
         $archived = true;
         if ($debug) {
             $msg_text .= "Debug: $showname is archived.\n";
         $updated = get_archive_last_updated($showcode);
         $updated_time = $updated["time"];
         $updated_file_date = $updated["file_date"];
     } else {
         $archived = false;
         $updated_time = get_last_updated($showcode);
     }
}

Why would PHP think this variable is undefined?