I am creating a chatbot using Dialogflow. I need to use the webhook service. I have been able to successfully read the webhook request generated at my server using PHP. I am able to do use the data from webhook to do necessary stuff. But, I am not able to figure out the way to send JSON respone back to Dialogflow from PHP.
Code that I have tried:
<?php
$webhookContent = "";
$webhook = fopen('php://input' , 'rb');
while (!feof($webhook)) {
$webhookContent .= fread($webhook, 4096);
}
$data = json_decode($webhookContent);
$json = '{"fulfillmentMessages": [{"text": {"text": ["Text response from webhook"]}}]}';
$myfile = fopen("chatbot.txt", "a") or die("Unable to open file!");
fwrite($myfile, $webhookContent."\r\n");
fclose($myfile);
echo json_encode($json);
http_response_code(200);
?>
Above is a dummy of code that I am using. To send response I have tried the following options but nothing is working.
echo json_encode($json);
return json_encode($json);
return $json;
On Dialogflow it shows [empty response]