Registro y login

[jossman1988]

Buenas estoy haciendo unlogin para android con java php y mysqli y al intentar registrarme me da este error:

E/JSON﹕ {"tag":"register","success":0,"error":1,"error_msg ":"JSON Error occured in Registartion"}


index.php

Código PHP:

  <?php
 
/**
 PHP API for Login, Register, Changepassword, Resetpassword Requests and for Email Notifications.
 **/
 
if (isset($_POST['tag']) && $_POST['tag'] != '') {
    // Get tag
    $tag = $_POST['tag'];
 
    // Include Database handler
    require_once 'include/DB_Functions.php';
    $db = new DB_Functions();
    // response Array
    $response = array("tag" => $tag, "success" => 0, "error" => 0);
 
    // check for tag type
    if ($tag == 'login') {
        // Request type is check Login
        $email = $_POST['email'];
        $password = $_POST['password'];
 
        // check for user
        $user = $db->getUserByEmailAndPassword($email, $password);
        if ($user != false) {
            // user found
            // echo json with success = 1
            $response["success"] = 1;
            $response["user"]["fname"] = $user["firstname"];
            $response["user"]["lname"] = $user["lastname"];
            $response["user"]["email"] = $user["email"];
        $response["user"]["uname"] = $user["username"];
            $response["user"]["uid"] = $user["unique_id"];
            $response["user"]["created_at"] = $user["created_at"];
            
            echo json_encode($response);
        } else {
            // user not found
            // echo json with error = 1
            $response["error"] = 1;
            $response["error_msg"] = "Incorrect email or password!";
            echo json_encode($response);
        }
    } 
  else if ($tag == 'chgpass'){
  $email = $_POST['email'];
 
  $newpassword = $_POST['newpas'];
  
 
  $hash = $db->hashSSHA($newpassword);
        $encrypted_password = $hash["encrypted"]; // encrypted password
        $salt = $hash["salt"];
  $subject = "Change Password Notification";
         $message = "Hello User,\n\nYour Password is sucessfully changed.\n\nRegards,\nLearn2Crack Team.";
          $from = "[email protected]";
          $headers = "From:" . $from;
    if ($db->isUserExisted($email)) {
 
 $user = $db->forgotPassword($email, $encrypted_password, $salt);
if ($user) {
         $response["success"] = 1;
          mail($email,$subject,$message,$headers);
         echo json_encode($response);
}
else {
$response["error"] = 1;
echo json_encode($response);
}
 
 
            // user is already existed - error response
           
           
        } 
           else {
 
            $response["error"] = 2;
            $response["error_msg"] = "User not exist";
             echo json_encode($response);
 
}
}
else if ($tag == 'forpass'){
$forgotpassword = $_POST['forgotpassword'];
 
$randomcode = $db->random_string();
  
 
$hash = $db->hashSSHA($randomcode);
        $encrypted_password = $hash["encrypted"]; // encrypted password
        $salt = $hash["salt"];
  $subject = "Password Recovery";
         $message = "Hello User,\n\nYour Password is sucessfully changed. Your new Password is $randomcode . Login with your new Password and change it in the User Panel.\n\nRegards,\nLearn2Crack Team.";
          $from = "[email protected]";
          $headers = "From:" . $from;
    if ($db->isUserExisted($forgotpassword)) {
 
 $user = $db->forgotPassword($forgotpassword, $encrypted_password, $salt);
if ($user) {
         $response["success"] = 1;
          mail($forgotpassword,$subject,$message,$headers);
         echo json_encode($response);
}
else {
$response["error"] = 1;
echo json_encode($response);
}
 
 
            // user is already existed - error response
           
           
        } 
           else {
 
            $response["error"] = 2;
            $response["error_msg"] = "User not exist";
             echo json_encode($response);
 
}
 
}
else if ($tag == 'register') {
        // Request type is Register new user
        $fname = $_POST['fname'];
        $lname = $_POST['lname'];
        $email = $_POST['email'];
        $uname = $_POST['uname'];
        $password = $_POST['password'];
 
 
        
        // check if user is already existed
                    // store user
            $user = $db->storeUser($fname, $lname, $email, $uname, $password);
            if ($user) {
                // user stored successfully
            $response["success"] = 1;
            $response["user"]["fname"] = $user["firstname"];
            $response["user"]["lname"] = $user["lastname"];
            $response["user"]["email"] = $user["email"];
        $response["user"]["uname"] = $user["username"];
            $response["user"]["uid"] = $user["unique_id"];
            $response["user"]["created_at"] = $user["created_at"];
                           
                echo json_encode($response);
            } else {
                // user failed to store
                $response["error"] = 1;
                $response["error_msg"] = "JSON Error occured in Registartion";
                echo json_encode($response);
            
        }
    } else {
         $response["error"] = 3;
         $response["error_msg"] = "JSON ERROR";
        echo json_encode($response);
    }
} else {
    echo "Learn2Crack Login API";
}
?>   

Me pueden ayudar?
gracias un saludo