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How to write $stmt in log from PHP script?

$stmt = $this->pdo->prepare('SELECT * FROM usersTable WHERE udid = ? LIMIT 1');

        $stmt->execute(array($udid));

        $user = $stmt->fetch(PDO::FETCH_OBJ);

 

        writeToLog('handleMessage SELECT * FROM usersTable WHERE udid = ? LIMIT 1');

 

        if ($user !== false)

        {

            // Put the sender's name and the message text into the JSON payload

            // for the push notification.

            $payload = $this->makePayload($user->nickname, $text);

 

            writeToLog('handleMessage Payload: ' . $payload);

 

            // Find the device tokens for all other users who are registered

            // for this secret code. We exclude the device token of the sender

            // of the message, so he will not get a push notification. We also

            // exclude users who have not submitted a valid device token yet.

            $stmt = $this->pdo->prepare("SELECT device_token FROM usersTable WHERE secret_code = ? AND device_token <> ? AND device_token <> '0'");

            $stmt->execute(array($user->secret_code, $user->device_token));

            $tokens = $stmt->fetchAll(PDO::FETCH_COLUMN);

                writeToLog('handleMessage Tokens: ' . $tokens); // It is showing value like 'Array'

 

            // Send out a push notification to each of these devices.

                    // If the senders secret code is differ from registered secret code this foreach loop won't execute

            foreach ($tokens as $token)

            {

                writeToLog('Sending payload and token to addPushNotification Function');

                writeToLog('token in foreach loop token: ' . $token);

                $this->addPushNotification($token, $payload);

            }

        }