Describe your experience with building scalable and high-performance PHP applications. What strategies and technologies have you used for this purpose?

Building scalable and high-performance PHP applications involves various strategies. I've used techniques like caching (with Redis or Memcached), load balancing, and CDN integration to enhance performance. Additionally, I've optimized database queries, employed asynchronous processing with tools like RabbitMQ, and adopted microservices architecture to achieve scalability and maintainability.