How do i fix my JSON format by using php - php

Question

I try to send json format to my android app , but i find that my json format is uncorrect.
{data={"image":"http:\/\/www.androidhive.info\/wp-content\/uploads\/2016\/01\/Air-1.png","message":{"chat_room_id":"","created_at":"2017-03-22 3:34:30","message_id":"","message":"77"},"user":{"user_id":null,"gcm_registration_id":null,"name":null,"created_at":null,"email":null}}, flag=0, title=Google Cloud Messaging, is_background=false}
I set the data like this:
$app->post('/users/send_to_all',
function() use ($app) {
$response = array();
verifyRequiredParams(array('user_id', 'message'));
require_once __DIR__ . '/../libs/gcm/gcm.php';
require_once __DIR__ . '/../libs/gcm/push.php';
$db = new DbHandler();
$user_id = $app->request->post('user_id');
$message = $app->request->post('message');
require_once __DIR__ . '/../libs/gcm/gcm.php';
require_once __DIR__ . '/../libs/gcm/push.php';
$gcm = new GCM();
$push = new Push();
//get the user using userid
$user = $db->getUser($user_id);
//creating tmp message , skipping database insertion
$msg = array();
$msg['message'] = $message;
$msg['message_id'] = '';
$msg['chat_room_id'] = '';
$msg['created_at'] = date('Y-m-d G:i:s');
$data = array();
$data['user'] = $user;
$data['message'] = $msg;
$data['image'] = 'http://www.androidhive.info/wp-content/uploads/2016/01/Air-1.png';
$push->setTitle("Google Cloud Messaging");
$push->setIsBackground(FALSE);
$push->setFlag(PUSH_FLAG_USER);
$push->setData($data);
//sending message to topic `global`
//on the device every user should subscribe to `global` topic
$gcm->sendToTopic('global', $push->getPush());
$response['user'] = $user;
$response['error'] = false;
echoRespnse(200, $response);
});
Here is my Push.php about getPush():
public function getPush() {
$res = array();
$res['title'] = $this->title;
$res['is_background'] = $this->is_background;
$res['flag'] = $this->flag;
$res['data'] = $this->data;
return $res;
}
Here is my Gcm.php about sendToTopic:
//sending message to a topic by topic id
public function sendToTopic($to, $message) {
$fields = array(
'to' => '/topics/' . $to,
'data' => $message,
);
return $this->sendPushNotification($fields);
}
I'm really not familiar with php , how do i fix the JSON format ?
Any help would be appreciated , thanks in advance !
I update my question , i find json_encode in my Gcm.php:
It's on curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
class GCM {
//constructor
function __construct() {
}
//sending push message to single user by gcm registration id (array 最後面有， 待看)
public function send($to, $message) {
$fields = array(
'to' => $to,
'data' => $message,
);
return $this->sendPushNotification($fields);
}
//sending message to a topic by topic id
public function sendToTopic($to, $message) {
$fields = array(
'to' => '/topics/' . $to,
'data' => $message,
);
return $this->sendPushNotification($fields);
}
//sending push message to multiple users by gcm registration ids
public function sendMultiple($registration_ids, $message) {
$fields = array(
'registration_ids' => $registration_ids,
'data' => $message,
);
return $this->sendPushNotification($fields);
}
//function makes curl request to gcm servers (__DIR__ 待看)
private function sendPushNotification($fields) {
//include config
include_once __DIR__ . '/../../include/config.php';
//Set POST variable
//$url = 'https://gcm-http.googleapis.com/gcm/send';
$url='https://fcm.googleapis.com/fcm/send';
$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_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 (=有三個?)
$result = curl_exec($ch);
if ($result === FALSE){
die('Curl failed: '. curl_error($ch));
}
//close connection
curl_close($ch);
return $result;
}
}
?>
It's still let my json format incorrect , how do i fix ?

Answer 1

PHP has some built-in json functions, you need json_encode() and json_decode().
For example this code:
<?php
$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($arr);
?>
Will print:
{"a":1,"b":2,"c":3,"d":4,"e":5}
Here's the link to documentation for json_encode() and for the entire json in php documentation.
Hope this helps.

Answer 2

Your JSON is invalid. try:
{"data":{"image":"http:\/\/www.androidhive.info\/wp-content\/uploads\/2016\/01\/Air-1.png","message":{"chat_room_id":"","created_at":"2017-03-22 3:34:30","message_id":"","message":"77"},"user":{"user_id":null,"gcm_registration_id":null,"name":null,"created_at":null,"email":null}}, "flag":0, "title":"Google Cloud Messaging", "is_background":false}
Notice ive replaced usage of = with : and wrapped keys and strings in quotes (")
To get it into a nice json string with php you need to build your array correctly first. Possible way is to setup a response array and then you can json_encode() it.
$response =[
'data' => $data,
'flag' => 0,
'title' => 'Google Cloud Messaging',
'is_background' => false.
];
now you can
json_encode($response);