push notification - Echo Device Token Using Php -

how can echo $token value in api.php file? app uses push notifications , thusly $token variable in api file gets set 64 character device token each user gets when app downloaded. far token gets posted database, need able echo out. ultimate goal set $token global variable , pass new file use in additional php statements. echo can make sure can explicitly first.

 <?php   // server api pushchat iphone app. use api, app // sends http post request our url. post data contains field "cmd" // indicates api command should executed.  try  { // running in development or production mode? can switch // between these 2 in apache virtualhost configuration. if (!defined('application_env'))     define('application_env', getenv('application_env') ? getenv('application_env') : 'production'); // development  // in development mode, show errors because want  // know them. don't in production mode because might // expose critical details of our app or our database. critical php errors // still logged in php , apache error logs, it's // idea keep eye on them. if (application_env == 'development') {     error_reporting(e_all|e_strict);     ini_set('display_errors', 'on');  } else {     error_reporting(0);     ini_set('display_errors', 'off'); }  // load config file. prefer keep configuration settings in // separate file don't have mess around in main code if // want change settings. require_once 'api_config.php'; $config = $config[application_env];  // in development mode, fake delay makes testing more realistic. // you're running on fast local server in production // mode people using on mobile device on slow connection. if (application_env == 'development')     sleep(0); //here // keep code clean, put api own class. create // instance of class , let handle request.  $api = new api($config); $api->handlecommand();  echo "ok" . php_eol;  } catch (exception $e) { // code throws exception when goes horribly wrong; e.g. // no connection database made. in development mode, // show these exception messages. in production mode, return // "500 server error" message.  if (application_env == 'development')     var_dump($e); else     exitwithhttperror(500);  }  ////////////////////////////////////////////////////////////////////////////////  function exitwithhttperror($error_code, $message = '') { //here  switch ($error_code) {     case 400: header("http/1.0 400 bad request"); break;     case 403: header("http/1.0 403 forbidden"); break;     case 404: header("http/1.0 404 not found"); break;     case 500: header("http/1.0 500 server error"); break; } //here header('content-type: text/plain');  if ($message != '')     header('x-error-description: ' . $message); //here /*exit;*/ }  function isvalidutf8string($string, $maxlength, $allownewlines = false) {  if (empty($string) || strlen($string) > $maxlength)     return false;  if (mb_check_encoding($string, 'utf-8') === false)     return false;  // don't allow control characters, except possibly newlines  ($t = 0; $t < strlen($string); $t++) {     $ord = ord($string{$t});      if ($allownewlines && ($ord == 10 || $ord == 13))         continue;      if ($ord < 32)         return false; }  return true; }  function truncateutf8($string, $maxlength) { $origstring = $string; $origlength = $maxlength;  while (strlen($string) > $origlength) {     $string = mb_substr($origstring, 0, $maxlength, 'utf-8');     $maxlength--; }  return $string; }  ////////////////////////////////////////////////////////////////////////////////  //here new: try echo here  class api { // because payload allows 256 bytes , there overhead // limit message text 190 characters. const max_message_length = 190;  private $pdo;  function __construct($config) {     // create connection database.     $this->pdo = new pdo(         'mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'],          $config['db']['username'],          $config['db']['password'],         array());      // if there error executing database queries, want pdo     // throw exception. our exception handler exit script     // "500 server error" message.     $this->pdo->setattribute(pdo::attr_errmode, pdo::errmode_exception);      // want database handle strings utf-8.     $this->pdo->query('set names utf8'); }  function handlecommand() {      // figure out command client sent , let corresponding     // method handle it. if command unknown, exit error     // message.     if (isset($_post['cmd']))     {         switch (trim($_post['cmd']))         {             case 'join': $this->handlejoin(); return;             case 'leave': $this->handleleave(); return;             case 'update': $this->handleupdate(); return;             case 'message': $this->handlemessage(); return;         }     }      exitwithhttperror(400, 'unknown command'); }  // "join" api command registers user receive notifications // sent in specific "chat room". each chat room identified // secret code. users register same secret code can // see each other's messages. // // command takes following post parameters: // // - user_id:  unique identifier. must string of 40 hexadecimal characters. // - token: device's device token. must string of 64 hexadecimal //          characters, or "0" if no token available yet. // - name:  nickname of user. must utf-8 string of maximum 255 //          bytes. first 20 bytes shown in push  //          notifications. // - code:  secret code identifies chat room. must utf-8 //          string of maximum 255 bytes. //   function handlejoin() {      //function getuserid;     global $userid;     $userid = $this->getuserid();     $token = $this->getdevicetoken(true);     $name = $this->getstring('name', 255);     $code = $this->getstring('code', 255);      // when client sends "join" command, add new record     // active_users table. identify client user_id     // provides. when client sends "leave" command, delete     // record active_users table.      // theoretically possible client sends "join" command     // while user_id still present in active_users (because did not     // send "leave" command). in case, remove old     // record first , insert new one.      $this->pdo->begintransaction();      $stmt = $this->pdo->prepare('delete active_users user_id = ?');     $stmt->execute(array($userid));      $stmt = $this->pdo->prepare('insert active_users (user_id, device_token, nickname, secret_code, ip_address) values (?, ?, ?, ?, ?)');     $stmt->execute(array($userid, $token, $name, $code, $_server['remote_addr']));      $this->pdo->commit();  }  // "leave" api command removes user chat room. user // no longer receive push notifications messages sent room. // // command takes following post parameters: // // - user_id: unique identifier. must string of 40 hexadecimal characters. // function handleleave() {     $userid = $this->getuserid();     $stmt = $this->pdo->prepare('delete active_users user_id = ?');     $stmt->execute(array($userid)); }  // "update" api command gives user new device token. // // command takes following post parameters: // // - user_id:  unique identifier. must string of 40 hexadecimal characters. // - token: device's device token. must string of 64 hexadecimal //          characters. // function handleupdate() {     $userid = $this->getuserid();     $token = $this->getdevicetoken(false);     $stmt = $this->pdo->prepare('update active_users set device_token = ? user_id = ?');     $stmt->execute(array($token, $userid));  }  // "message" api command sends message users registered // same secret code sender of message. // // command takes following post parameters: // // - user_id: unique identifier. must string of 40 hexadecimal characters. // - text: message text. must utf-8 string of maximum 190 bytes. // function handlemessage() {     $userid = $this->getuserid();     /*$text = $this->getstring('text', self::max_message_length, true);*/      // first, record sender of message     // active_users table. gives nickname, device token, ,     // secret code user.      $stmt = $this->pdo->prepare('select * active_users user_id = ? limit 1');     $stmt->execute(array($userid));     $user = $stmt->fetch(pdo::fetch_obj);      if ($user !== false)     {         // put sender's name , message text json payload         // push notification.         $payload = $this->makepayload($user->nickname/*, $text*/);          // find device tokens other users registered         // secret code. exclude device token of sender         // of message, not push notification.         // exclude users have not submitted valid device token yet.         $stmt = $this->pdo->prepare("select device_token active_users secret_code = ? , device_token <> ? , device_token <> '0'");         $stmt->execute(array($user->secret_code, $user->device_token));         $tokens = $stmt->fetchall(pdo::fetch_column);          // send out push notification each of these devices.         foreach ($tokens $token)         {             $this->addpushnotification($token, $payload);         }     } }  // retrieves user identifier post data. if user_id not // appear valid, script exits error message. function getuserid() {        if (!isset($_post['user_id']))         exitwithhttperror(400, 'missing user_id');      $userid = trim(urldecode($_post['user_id']));     if (!$this->isvaliduserid($userid))         exitwithhttperror(400, 'invalid user_id');      return $userid; }  // checks whether format of user identifier correct (40 hex // characters or 32 simulator). function isvaliduserid($userid) {     if (strlen($userid) != 40 && strlen($userid) != 32)  // 32 simulator         return false;      if (preg_match("/^[0-9a-fa-f]+$/", $userid) == 0)         return false;      return true; }  // retrieves device token post data. if token not // appear valid, script exits error message. function getdevicetoken($maybeempty = false) {     if (!isset($_post['token']))         exitwithhttperror(400, 'missing device token');      $token = trim($_post['token']);      // "join" command allows token value of "0" specified,     // necessary in case client did not yet obtain device     // token @ point. allow such clients join,     // not receive notifications until provide valid token     // using "update" command.     if ($maybeempty && $token == "0")         return $token;      if (!$this->isvaliddevicetoken($token))         exitwithhttperror(400, 'invalid device token');      return $token;   }  // checks whether format of device token correct (64 hexadecimal // characters). note: have no means verify whether device token // issued apns , corresponds actual device. function isvaliddevicetoken($devicetoken) {     if (strlen($devicetoken) != 64)         return false;      if (preg_match("/^[0-9a-fa-f]{64}$/", $devicetoken) == 0)         return false;      return true; }  // looks in post data field given name. if field // not valid utf-8 string, or long, script exits // error message. function getstring($name, $maxlength, $allownewlines = false) {     if (!isset($_post[$name]))         exitwithhttperror(400, "missing $name");      $string = trim($_post[$name]);     if (!isvalidutf8string($string, $maxlength, $allownewlines))         exitwithhttperror(400, "invalid $name");      return $string; }  // creates json payload push notification message. "alert" // text has following format: "sender_name: message_text". recipients // can obtain name of sender parsing alert text // first colon followed space. function makepayload($sendername, $text) {     // convert nickname of sender json , truncate maximum     // length of 20 bytes (which may less 20 characters).     $namejson = $this->jsonencode($sendername);     $namejson = truncateutf8($namejson, 20);      // convert , truncate message text     $textjson = $this->jsonencode($text);     $textjson = truncateutf8($textjson, self::max_message_length);      // combine json string     $payload = '{"aps":{"alert":"' . $namejson . ': zapped live picture of you. tap message zap them back. ' . $textjson . '","sound":"beep.caf"}}';     return $payload; }  // don't use php's built-in json_encode() function because converts // utf-8 characters \uxxxx. eats 6 characters in payload // no reason, json supports utf-8 fine. function jsonencode($text) {     static $from = array("\\", "/", "\n", "\t", "\r", "\b", "\f", '"');     static $to = array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"');     return str_replace($from, $to, $text); }  // adds push notification push queue. notification not // sent immediately. server runs separate script, push.php,  // periodically checks new entries in database table , sends // them apns servers. function addpushnotification($devicetoken, $payload) {     // payloads have maximum size of 256 bytes. if payload     // large (which shouldn't happen), won't send notification.     if (strlen($payload) <= 256)     {         $stmt = $this->pdo->prepare('insert push_queue (device_token, payload, time_queued) values (?, ?, now())');         $stmt->execute(array($devicetoken, $payload));     }  }  }  ?> 

the above file has 4 main commands used in app via afnetworking join, update, leave, message.

update

when users download app, inately register device tokens

- (void)application:(uiapplication*)application didregisterforremotenotificationswithdevicetoken:(nsdata*)devicetoken {  nsstring* newtoken = [devicetoken description]; newtoken = [newtoken stringbytrimmingcharactersinset:[nscharacterset charactersetwithcharactersinstring:@"<>"]]; newtoken = [newtoken stringbyreplacingoccurrencesofstring:@" " withstring:@""];  nslog(@"my token is: %@", newtoken);  } 

notice nslog statement echoes out token in nslog this

this example method uses objective c j son , afnetworking framework post token (and other paramaters) database using nsdictionary. update method. php counterpart can found in api.php file above.

- (void)postupdaterequest { uinavigationcontroller *navigationcontroller = (uinavigationcontroller*)_window.rootviewcontroller; chatviewcontroller *chatviewcontroller = (chatviewcontroller*)[navigationcontroller.viewcontrollers objectatindex:0];  datamodel *datamodel = chatviewcontroller.datamodel;  nsdictionary *params = @{@"cmd":@"update",                          @"user_id":[datamodel userid],                          @"token":[datamodel devicetoken]};  afhttpclient *client = [afhttpclient clientwithbaseurl:[nsurl urlwithstring:serverapiurl]]; [client  postpath:@"/api.php"  parameters:params  success:nil failure:nil]; } 

lastly, notice how device token gets inserted in database.

goal want add echo statement php file above echo out device token. testing user icey info can post database. thing is; no matter put echo statement, nothing shows or warning.