convert data to JSON array - php

Question

i am trying to use the push notification in google cloud messages and i am passing an array om registration ids, but for some reason i got the following error:
Field "data" must be a JSON array: You have just invited to play 'Soccer'
this is the part that i am trying to pass:
"registred_ids":["APA91bF9itasGCSK8NbD9u5GJWnEmbWCdS0sEn_xxRVbVpfI0_3FKkvxVBr5xtdE26VZgOO8rCBpf4CaAzHUbMj7PmmDxqpdbWO6VBrPB8dW4CPqPovJbnB_p1Ha_fuwyf8SnOqgOFajK8HEdiZO65qUljO2wCuuDQ"]
not the code of the gcm is :
<?php
class GCM {
function __construct() {
}
/**
* Sending Push Notification
*/
public function send_notification($registatoin_ids, $message) {
// include config
include_once 'connection.php';
// Set POST variables
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
'registration_ids' => $registatoin_ids,
'data' => $message,
);
$headers = array(
'Authorization: key=' .GOOGLE_API_KEY,
'Content-Type: application/json'
);
// Open connection
$ch = curl_init();
// Set the url, number of POST vars, POST data
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Disabling SSL Certificate support temporarly
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
// Execute post
$result = curl_exec($ch);
if ($result === FALSE) {
die('Curl failed: ' . curl_error($ch));
}
// Close connection
curl_close($ch);
echo $result;
}
}
?>
and the code which passing the registration ids is:
<?php
include 'response_process.php';
include 'gcm.php';
class CreateEvent implements ResponseProcess {
public function dataProcess($dblink)
{
$output = array();
$sport = $_POST["sport_type"];
$date = date("Y-m-d",strtotime(str_replace('/','-',$_POST["date"])));
$s_time =$_POST["s_time"];
$e_time = $_POST["e_time"];
$lon = $_POST["lon"];
$lat = $_POST["lat"];
$event_type = $_POST["event_type"];
$max_p = $_POST["max_participants"];
$sched = $_POST["scheduled"];
$gen = $_POST["gender"];
$min_age = $_POST["minAge"];
$manager = $_POST["manager"];
$query = "SELECT * FROM event WHERE (event.longtitude = '$lon' AND event.latitude = '$lat')
AND event.event_date = '$date' And ((event.start_time BETWEEN '$s_time' AND '$e_time') OR (event.end_time BETWEEN '$s_time' AND '$e_time'))";
//AND (event.start_time = '$s_time' AND event.end_time = '$e_time')
//check time and place of the event
$result_q = mysqli_query($dblink,$query) or die (mysqli_error($dblink));
if(!$result_q)
{
$output["flag"]= "select failed";
$output["msg"] = $result_q;
return json_encode($output);
}
//case date and time are available
else {
$no_of_rows = mysqli_num_rows($result_q);
if ($no_of_rows < 1) {
$output["flag"] = "success";
$output["msg"] = "insert event";
$result = mysqli_query($dblink, "INSERT into event(manager_id,kind_of_sport,event_date,start_time,end_time,longtitude,latitude,private,gender,min_age,max_participants,current_participants,scheduled,event_status)
VALUES ('$manager','$sport','$date','$s_time','$e_time','$lon','$lat','$event_type','$gen','$min_age','$max_p','1','$sched','1')") or die (mysqli_error($dblink));
if (!$result) {
$output["flag"] = "failed to create event";
// return (json_encode($output));
}
else{
if(isset($_POST["invitedUsers"])){
$query_id = "SELECT id From event WHERE event.event_date = '$date' and event.start_time = '$s_time' and event.end_time = '$e_time'";
$event_s_res = mysqli_query($dblink,$query_id) or die (mysqli_error($dblink));
if(!$event_s_res)
{
$output["flag"] = "failed";
$output["msg"] = "Event id not found";
}
else{
$row = mysqli_fetch_assoc($event_s_res);
$no_of_rows = mysqli_num_rows($event_s_res);
if($no_of_rows > 1 || $no_of_rows == 0)
{
$output["flag"] = "failed";
$output["msg"] = "Event id not found";
}
else{
$event_id = $row["id"];
$json = $_POST["jsoninvited"];
$json = json_decode($json);
$output["size_invited"] = count($json);
$query_users = "SELECT id,gcm_id From users WHERE ";
$i=0;
$size_of_param = (count($json));
foreach($json as $user) {
if ($i < $size_of_param - 1)
// add a space at end of this string
$query_users .= "users.mobile = '".$user."' or ";
else {
// and this one too
$query_users .= "users.mobile = '".$user."' ";
$output["users"][] = $user['mobile'];
}
$i++;
$output["index"]=$i;
}
$output["user_query"]= $query_users;
$event_user_s_res = mysqli_query($dblink,$query_users) or die (mysqli_error($dblink));
if(!$event_user_s_res)
{
$output["flag"] = "failed";
$output["msg"] = "user id not found";
}
$insert_query = "INSERT into attending (event_id,user_id,status) VALUES ";
$i=0;
$status = "deny";
$registration_ids = array();
while($row_user = mysqli_fetch_assoc($event_user_s_res))
{
$registration_ids[$i]=$row_user["gcm_id"];
if($i<$size_of_param - 1)
$insert_query .= "('" .$event_id. "','" .$row_user["id"]. "','" .$status. "'), ";
else
$insert_query .= "('".$event_id."','".$row_user["id"]."','".$status."') ";
$i++;
}
$insert_query_res = mysqli_query($dblink,$insert_query) or die (mysqli_error($dblink));
if(!$insert_query_res)
{
$output["flag"] = "failed";
$output["msg"] = "failed to insert to attending table";
}else{
$output["id_query"]= $insert_query;
$output["registred_ids"] = $registration_ids;
$output["msg"] = "success to insert into attending";
$gcm = new GCM();
$message = "You have just invited to play '".$sport."'";
$output["gcm_message"]=$message;
$gcm_res = $gcm->send_notification($registration_ids,$message);
$output["gcm_res"] = $gcm_res;
} //els of $insert_query_res
} //else of $no_of_rows > 1 || $no_of_rows == 0
} // else of $event_s_res
} //if isset($_POST["invitedUsers"]
} // if $result
} // if $no_of_rows < 1
else {
$output["flag"] = "failed";
$output["msg"] = "Place is already occupied in this time";
}
}
return json_encode($output);
}
}

Answer 1

Use this-
$fields = array(
'registration_ids' => $registatoin_ids,
'data' => array("message" => $message),
);

Answer 2

It says the data field needs to be an array, but you are setting it to $message, which is a string, not an array.

Answer 3

Field "data" must be a JSON array: You have just invited to play 'Soccer'
This means the value passed in data node is not a json.
Encoding $message into json will fix the error.