//// java.php
<?php
    $response = array();
    header("Content-Type:application/json");
    if($_POST){
        $token = $_POST['token'];
        include 'JWTManager.php';
        $check = CheckToken($token,$key);
        if(isset($check["success"]) && $check["success"] == -1){
            $response["success"] = -1;
            $response["message"] = $check["message"];
        }else{
            $response = $check;
        }
    }
    echo json_encode($response);
?>
//// JWTManager.php
<?php
require_once 'vendor/autoload.php';
use \Firebase\JWT\JWT;
$key = 'cxrrQXzprE';
function GenerateToken($token,$key){
    return JWT::encode($token, $key);
}

function CheckToken($jwt,$key){
    try{
        $decoded = JWT::decode($jwt,$key,array('HS256'));
        return (array)$decoded;
    }catch(Exception $e){
        $error = array();
        $error["message"] = $e->getMessage();
        $error["success"] = -1;
        return $error;
    }
}