Function
$response = Unirest\Request::post(“https://text-sentiment.p.mashape.com/analyze”,
array(
“X-Mashape-Key” => “GBJcc8W9nEmshsm38YliVbyEq2b4p193MybjsnzRreJ2XV9R7I”,
“Content-Type” => “application/x-www-form-urlencoded”,
“Accept” => “application/json”
),
json_encode(array(
“text” => “I am not really happy”
))
);

Response
{“code”:200,“raw_body”:"{“text”:"",“totalLines”:1,“pos”:0,“neg”:0,“mid”:1,“pos_percent”:“0%”,“neg_percent”:“0%”,“mid_percent”:“100%”}",“body”:{“text”:"",“totalLines”:1,“pos”:0,“neg”:0,“mid”:1,“pos_percent”:“0%”,“neg_percent”:“0%”,“mid_percent”:“100%”},“headers”:{“0”:“HTTP/1.1 200 OK”,“Content-Type”:“text/plain”,“Date”:“Fri, 16 Nov 2018 17:02:43 GMT”,“Server”:“Mashape/5.0.6”,“X-Powered-By”:“Express”,“Content-Length”:“109”,“Connection”:“keep-alive”}}