Create a PHP code for Authentication in web api using Managing Connection

Hi I have already implemented web api auth using the mt5 given doc.  https://support.metaquotes.net/en/docs/mt5/api/webapi_pings#test_access

it is working fine. But the problem is it's creating a new new connection on every request. MT5 has gave solution for this as well. https://support.metaquotes.net/en/docs/mt5/api/webapi_pings. But am unable to implement that.
For the auth I am using this code base, https://support.metaquotes.net/en/docs/mt5/api/webapi_https#example

now your task is to give me a code for implementing the ping, so that the connection doesn’t increase.