Zend Server Professional Edition for RHEL on EC2 is the enterprise way to run PHP in the cloud. It's an application server with a supported PHP runtime that can scale applications seamlessly across cloud resources, and comes from the company that helped write PHP. Zend Server gives PHP developers and DevOps engineers the tools they can use like Z-Ray debugging solution, deployment automation, performance monitoring, request analysis, and configuration management so applications run faster, scale better, and stay up longer. It is particularly useful for running mobile app back ends that require scalability based on demand. You can even create a scalable Zend Server cluster using our CloudFormation template generator: http://www.zend.com/en/products/server/cloudformation