Google Maps API Integration in PHP

I need help with integrating Google Maps API into a PHP project suitable for providing advanced user interactivity regarding directions and route planning.

The tasks include:
- Fetching directions or routes via Google Maps API
- Implementing features to plan routes, taking user input into account

The ideal freelancer for this job has:
- Extensive experience in PHP development
- In-depth knowledge of Google Maps API integration
- Competency in API route planning functionalities
- Familiarity with advanced user interactive features on Google Maps.