How can I install TeamSpeak on my ubuntu server?

Is it possible to do more than one comparison within an "if" in Nginx? For instance in a language like JAVA we use "if(comparison 1 || comparison 2)" and the || works as an "or"

How can I install a new PHP version different to the current one? if I want to install the latest PHP version is with "sudo apt-get install php5-fpm php5-mysql" but I need to install PHP 5.4.35 due to compatibility is...