"Use of undefined constant success - assumed 'success'" error parsing json response - php

Question

im using google recaptcha and the way of my validation is through ajax, everything is working, I got a response
{
success: "false/true"
}
but i got an error saying "Use of undefined constant success - assumed 'success" on line 30, any ideas, help, suggestions, recommendations?
this is my code on the controller (the one i use in communicating the google recaptcha API)
$captcha=$request->input('g-recaptcha-response');
$response=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=mysitekey&response=".$captcha."&remoteip=".$_SERVER['REMOTE_ADDR']);
if($response.success == false) //this is the line 30
{
return 'You are spammer ! Get the out';
}else{
return 'Thanks for posting comment.';
}
this is the line 30 "$response.success == false"

Answer 1

You missed a couple of steps.
First you need to json_decode the response you get from the API
$responseData = json_decode($response);
Next you need to properly address the "success" element from which I assume will be an array, but you will verify this with a var_dump().
var_dump($responseData);
If you get an array then the if clause will look like this:
if ($responseData["success"]==false)
On the other hand if you get an object in the responseData, the `if clause will look like this
if ($responseData->success==false)
The dot notation is for javascript, in php the dot is a concatentation operator.