Adding a logger in production

[GingerSoo]

I am making some changes on the live site and i constantly need to add loggers (print_r) throughout the page for me to test. The problem is the site is healily populated by staff and I need it so I am for sure the only one to see this logger. I heard I can wrap the logger in an if with my Ip address but i thought I while back i tried that and the client still viewed it. Anybody have an ideas or the syntax needed to make this happen. By the way I think the PHP version is an older on