Rob Allen has a new post to his site showing the results of some testing he did when running a Zend Framework v1 application on PHP 7.
Zend Framework 1 is still actively maintained and we fully intend to ensure that ZF1 works with no problems on PHP 7 when its released. Now that PHP 7.0.0 Alpha 1 has been released, it's time to find out if your Zend Framework 1 app works with it. The easiest way to do this is to use a virtual machine. My preference is Vagrant with Rasmus' PHP7dev box.
He walks through the setup of the virtual machine via a simple Vagrantfile, configuring the latest PHP 7 version, an Nginx server and a basic database. Fortunately, his results turned out quite well with only one issue identified in his application (one with method names the same as class names). You can use this as a a guide to try out your own applications too. Be sure to check the UPGRADING file for a list ot possible breaks to help you track down issues you might be seeing.