This is a JSONPath [1] implementation for PHP based on Stefan Goessner's JSONPath script.

JSONPath is an XPath-like expression language for filtering, flattening and extracting data.

I believe that is improves on the original script (which was last updated in 2007) by doing a few things:

• Object-oriented code (should be easier to manage or extend in future)
• Expressions are parsed into tokens using some code cribbed from Doctrine Lexer and cached
• There is no eval() in use
• Performance is pretty much the same
• Any combination of objects/arrays/ArrayAccess-objects can be used as the data input which is great if you're de-serializing JSON in to objects or if you want to process your own data structures.

Autoloader: /usr/share/php/Flow/JSONPath/autoload.php

[1] http://goessner.net/articles/JsonPath/