This extension provides basic editing features for the PHP scripting language. Current editing features include:

• Syntax highlighting, including support for HTML code outside PHP tags and within documentation comments
• Outlining support for quickly collapsing classes and functions 
• Dropdown bars listing classes and functions within the current document

This extension has a relatively small feature set, but it's quite fast and usable. It was created as part of an experiment to provide editor features for multiple languages within a single document (PHP, HTML, and formatted documentation comments).

Download it from Visual Studio Extension Manager