Server for live experiment

[Jens Noriʇzsɔɥ]

The first error is due to a Windows madness, the byte order mark (BOM, https://en.wikipedia.org/wiki/Byte_order_mark). IIRC, you could change the encoding in Notepad++ to UTF-8 without BOM.

I am sorry that I can only help with the little things at the moment.

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Hm, a few remarks:

• you should use POST as you are wanting to change the state of your web server (store data),
  
• in this case you definitely receive the data as JSON, https://phyphox.org/wiki/index.php/Network_Connections has a PHP snippet on how to get it,
  
• you need to store the data somewhere and somehow (text or database, text perhaps a bit easier if you are not used to SQL),
  
• (best) a separate script reads this data, evaluates it, and finally displays it as a web page,
  
• create some magic so that the web page automagically updates every now and then.
  

For me, it appears that you yourself are calling the script so your result would be expected. If I am wrong, please apologize any obviousness above…