Does anyone know how to logging with this php-sdk?

[YingChen-dci]

I need to output log to integrate it to our system, then I tried to use "echo", "print_r", and also php "error_log" to output log from like " src/MediaServices/MediaServicesRestProxy.php ". But it didn't work.

As php error_log, I set the configuration in php.ini, then restart httpd, and using "error_log" to output log. But couldn't being logged.
display_errors = ON
error_log = "my php error log path"
error_reporting = E_ALL | E_STRICT

Anyone has thoughts about that?

Thanks in advance,
Ying