We don't have official PHP or JavaScript implementations of the Echoprint codegen (which is in C++) or the server (which is in Python).
The server includes an example web-based API that can be accessed via HTTP, so that should provide a convenient abstraction over the Python layer so that you can then access using standard tools and libraries from PHP or JS.
If you want to query the Echoprint database that is hosted behind The Echo Nest's song/identify API using a PHP or JS wrapper, then you may find either of these libraries useful:
https://github.com/echonest/nestjs
https://github.com/bshaffer/php-echonest-apiAndrew