Send Receive JSON POST data PHP - php

Question

I have a device where I execute this php file
$url = "https://xxxxx.com/raspberry/json.php";
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$headers = array(
"Accept: application/json",
"Content-Type: application/json",
);
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
$data = <<<DATA
{
"Device": "102",
"Status": "Power on",
}
DATA;
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
$resp = curl_exec($curl);
curl_close($curl);
var_dump($resp);
The receiver file
$data = file_get_contents('php://input');
echo $data;
$json = json_decode($data, true);
echo "Device: " . $json['Device'];
echo "Device: " . $json->Device;
print me
string(62) "{
"Device": "125",
"Status": "Power on",
}Device: Device: "
so why don't print me the single data? I expect it prints also the single element.
thanks

Answer 1

this is the correct files.
// SEND DATA
$url = "https://xxxx.com/raspberry/json.php";
//Initiate cURL.
$ch = curl_init($url);
//The JSON data.
$jsonData = array(
'Device' => '125',
'password' => 'Power on'
);
//Encode the array into JSON.
$jsonDataEncoded = json_encode($jsonData);
//Tell cURL that we want to send a POST request.
curl_setopt($ch, CURLOPT_POST, 1);
//Attach our encoded JSON string to the POST fields.
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonDataEncoded);
//Set the content type to application/json
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
//Execute the request
$result = curl_exec($ch);
and receive the data
// RECEIVE DATA
//Make sure that it is a POST request.
if (strcasecmp($_SERVER['REQUEST_METHOD'], 'POST') != 0) {
throw new Exception('Request method must be POST!');
}
//Make sure that the content type of the POST request has been set to application/json
$contentType = isset($_SERVER["CONTENT_TYPE"]) ? trim($_SERVER["CONTENT_TYPE"]) : '';
if (strcasecmp($contentType, 'application/json') != 0) {
throw new Exception('Content type must be: application/json');
}
//Receive the RAW post data.
$content = trim(file_get_contents("php://input"));
//Attempt to decode the incoming RAW post data from JSON.
$decoded = json_decode($content, true);
//If json_decode failed, the JSON is invalid.
if (!is_array($decoded)) {
throw new Exception('Received content contained invalid JSON!');
}
// Access to the data
$element = $decoded['Device'];
echo "Device: " .$element;
thanks to Will B.