undefined constant CURLOPT_GET - assumed 'CURLOPT_GET'

php curl

Try using CURLOPT_HTTPGET though I am not sure if it serves your purpose.

php curl

It happens when phpxxx-curl was not installed in your machine

php curl

There is nothing like CURLOPT_GET in the options for cURL that's why that error occured. Take a look at CURL options

CodeHunter