Hi, I found this trading code in github in this link https://github.com/coinables/bitmex-api-php. I tried running it but I got an error in line 78 that says Notice : Undefined offset: 0 in C:\xampp\htdocs\Bitmex\index.php on line 78. Solving this issue is much appreciated. Thanks! 
Iām using the same repo for my project.
It is working fine for me. Did you add you secret from Bitmex?
Yes. I added the secret but still I got the same result.