PHP Code Editor Enhancement

I need a skilled PHP developer to improve an existing code editor. The editor currently supports PHP and has auto-completion.

Key requirements:
- Add support for syntax highlighting and error detection
- Optimize auto-completion for PHP
- Ensure a user-friendly interface

Ideal Skills and Experience:
- Proficiency in PHP
- Experience with code editor development
- Strong understanding of syntax highlighting and error detection mechanisms
- UI/UX design experience is a plus

Please provide examples of similar work done.