Gonzalo Ayuso has a new post to his blog today showing some of the experimentation he's done with PHP 5.4 features like the short array syntax, calling methods through arrays and traits.

PHP5.4 it’s close and it’s time to start playing with the new cool features. I’ve created a new Virtual Machine to play with the new features available within PHP5.4. I wrote a post with the most exciting features (at least for me) when I saw the feature list in the alpha version. Now the Release Candidate is with us, so it’s the time of start playing with them. I also discover really cool features that I pass over in my first review.

Code snippets are included for each example for:

• Class member access on instantiation
• Short array syntax
• Support for Class::{expr}() syntax
• Indirect method call through array
• Callable typehint
• Traits
• Array dereferencing support

He points to this other post for a complete list of what's been added in 5.4.