What is the best way to read last lines (i.e. "tail") from a file using PHP?

In my PHP application I need to read multiple lines starting from the end of many files (mostly logs). Sometimes I need only the last one, sometimes I need tens or hundreds. Basically, I want something as flexible as the Unix tail command.

There are questions here about how to get the single last line from a file (but I need N lines), and different solutions were given. I'm not sure about which one is the best and which performs better.