AWS Sns publish stops the execution after sending the push notification (publish) in PHP

I'm trying to send AWS push notification (SNS) to multiple devices one by one. When i check the response of Publish, they are actually getting send. I have created different function for sending the SNS and calling it from another function. But after calling the Publish method the execution gets stop. The next statement after the called function does not get execute. I'm not able to find reason for this. Any ideas or suggestions please ?