Undefined array key "deviceId" in the cookie parse function

[francisco-giraldo]

I'm getting this error in the cookie parse function.

Undefined array key "deviceId"

in line amplitude/experiment-php-server/src/AmplitudeCookie.php:55

I'm getting this for a few users, not all of them.

you can reproduce this if you append any string to the amplitude cookie value

[tyiuhc]

Hi @francisco-giraldo, many thanks for raising this issue. To further assist on this issue, it would be useful to know:

1. The format/example of the failed cookie values
2. Whether the cookie key begins with AMP_ or amp_