I was looking to do some simple find/replace refactoring but rather than spend my time crafting clever regexes I decided I'd rather play around with the PHP AST and php-parser.
MutatingVisitor visits each node and conditionally applies a given mutation. MutatingParser is a wrapper around the php-parser boilerplate.
Get dependencies with composer install
array.php is an example that replaces all array() notation with [] notation.