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for an older version of Zend Framework.
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Installation — Zend Framework 2 2.1.5 documentation
Once you have a copy of Zend Framework available, your application needs to be able to access the framework classes found in the library folder. There are several ways to achieve this.
Failing to find a Zend Framework 2 installation, the following error occurs:
Fatal error: Uncaught exception 'RuntimeException' with message 'Unable to load ZF2. Run `php composer.phar install` or define a ZF2_PATH environment variable.'
To fix that, you can add the Zend Framework’s library path to the PHP include_path. Also, you should set an environment path named ‘ZF2_PATH’ in httpd.conf (or equivalent). i.e. SetEnv ZF2_PATH /var/ZF2 running Linux.
Rob Allen has kindly provided the community with an introductory tutorial, Getting Started with Zend Framework 2. Other Zend Framework community members are actively working on expanding the tutorial.