Hi Tian,
Unfortunately I haven’t identified the cause of the gibberish eye-tracking data files. What you could try to do is download PennElement_eyetracker.js and replace line 433 with sendLine('times', this.counts.times.join('.'));, then upload that file to your project’s Modules (or js_includes) folder. You’ll get a warning/error that the EyeTracker element is defined twice, but I think it should still work. Then, in your PHP script, you could replace $dictionary[$param][$trial] = explode('.', lzw_decode( $value ) ); with $dictionary[$param][$trial] = explode('.', $value ); and see if that works. The eye-tracking data files will be bigger, but they shouldn’t be insanely big, and hopefully no longer contain gibberish
Jeremy