bot.php

<?php
/*
POST /knowledgebases/{knowledgebase ID}/generateAnswer
Host: https://westus.api.cognitive.microsoft.com/qnamaker/v1.0
Ocp-Apim-Subscription-Key: {subscriber key}
Content-Type: application/json
{"question":"hi"}
*/
// EDIT HERE ----
$path = '/knowledgebases/{knowledgebase ID}/generateAnswer';
$api_key_header =  'Ocp-Apim-Subscription-Key: {subscriber key}';
// ****

$hostPart = 'https://westus.api.cognitive.microsoft.com/qnamaker/v1.0';

$url = $hostPart . $path;
$arr = array( 'question' => urlencode($_GET['question']));
$data_string = json_encode($arr);
//open connection
$ch = curl_init();

//set the url, number of POST vars, POST data
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch,CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    $api_key_header,
    'Content-Type: application/json',
    'Content-Length: ' . strlen($data_string))
);
//execute post
$result = curl_exec($ch);

//close connection
curl_close($ch);

echo $result;
?>