"Every major PHP framework uses it. How do I know? To my knowledge you can't use any of them with Facebook's hiphop out of the box. I suspect this is one of the main reason's no one uses hiphop even though it gives you a good deal of performance gains for PHP."
Zend Framework 1.10 - a fairly high-profile framework - has 1 instance of eval in a component I've never known anyone to use. I suspect hiphop has a few other issues with it, but... even more to the point, I don't think most people think they need hiphop. It's an unknown - it's a compilation step, and adds a couple extra steps of complexity. People can get a lot of performance gains by using Zend Server caching or APC with far less unknowns vs digging in to hiphop.
Additionally, hiphop has had some issues with postgres/pdo, closures, imap and more PHP stuff over the last year or so. It's a nice thing from facebook, but it was written for their own problems, not as a general use tool for everyone. If it can evolve in that direction, the adoption may go up. Until then there's far more well-tested ways to improve your performance of PHP.
Zend Framework 1.10 - a fairly high-profile framework - has 1 instance of eval in a component I've never known anyone to use. I suspect hiphop has a few other issues with it, but... even more to the point, I don't think most people think they need hiphop. It's an unknown - it's a compilation step, and adds a couple extra steps of complexity. People can get a lot of performance gains by using Zend Server caching or APC with far less unknowns vs digging in to hiphop.
Additionally, hiphop has had some issues with postgres/pdo, closures, imap and more PHP stuff over the last year or so. It's a nice thing from facebook, but it was written for their own problems, not as a general use tool for everyone. If it can evolve in that direction, the adoption may go up. Until then there's far more well-tested ways to improve your performance of PHP.