Load balancing PHP web application with three servers?

I've used HAProxy in a similar setup and I highly recommend it. It can run very well on a single server and you only need two servers for load balancing in case you want high availability.

I just yesterday created a configuration where NGINX server as a load balancer, behind which there are 2 PHP-FPM servers, 1 Memcache server and 1 MySQL server. NGINX was configured using Upstreaming feature and the related configuration lines are something like this.

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