发送voip推送通知后是否应关闭与APN的连接？

I am using a simplepush.php script to send voip pushes from user to user. My app can potentially make many of these push requests depending on how many users it acquires. Every example of simplepush.php that I found seems to explicitly close the connection at the end - here is my script (see last line):I am using a simplepush.php script to send voip