| 1 | How does the cache stampede problem occur, and what strategies help prevent it in a high traffic PHP application? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Advanced |
| 2 | How should a team design a comprehensive multi layer caching strategy for a high traffic PHP application, combining OPcache, application level caching, and a CDN? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Advanced |
| 3 | What is caching in a PHP application, and why is it important for improving performance? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Beginner |
| 4 | What is the difference between file based caching and in memory caching using tools like Redis or Memcached? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Beginner |
| 5 | What caching strategies are commonly used in Laravel applications, and how does the Cache facade simplify working with different cache backends? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Intermediate |
| 6 | How does cache invalidation work, and why is deciding when to clear a cache often considered one of the harder problems in caching? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Intermediate |
| 7 | What is the difference between page caching, query caching, and object caching, and when should each be used? PHP › Caching Strategies in PHP | PHP | Caching Strategies in PHP | Intermediate |
| 8 | How do file locking mechanisms in PHP, using the flock function, help prevent data corruption when multiple processes might write to the same file concurrently? PHP › File Handling & File System Functions | PHP | File Handling & File System Functions | Intermediate |
| 9 | What performance and caching considerations become especially important when developing a WordPress plugin that will run on a high traffic website? PHP › WordPress Plugin & Theme Development | PHP | WordPress Plugin & Theme Development | Advanced |
| 10 | What is OPcache, and how does it improve PHP application performance by caching compiled bytecode? PHP › Performance Optimization & OPcache | PHP | Performance Optimization & OPcache | Beginner |
| 11 | How do you bind an interface to a specific concrete implementation within a service container, and why is this a common and valuable pattern? PHP › Dependency Injection & Service Containers | PHP | Dependency Injection & Service Containers | Intermediate |
| 12 | How does API rate limiting work, and why is it an important protection mechanism for a public facing RESTful API? PHP › RESTful API Development with PHP | PHP | RESTful API Development with PHP | Intermediate |
| 13 | How does lazy loading versus eager loading of resources and how minimizing unnecessary work within a request's critical path help improve overall PHP application response times? PHP › Performance Optimization & OPcache | PHP | Performance Optimization & OPcache | Intermediate |
| 14 | How should a team approach a comprehensive performance optimization effort for a PHP application experiencing slow response times under production load, prioritizing which areas to address first? PHP › Performance Optimization & OPcache | PHP | Performance Optimization & OPcache | Advanced |
| 15 | How does the static keyword affect a variable declared inside a function, and how does this differ from a regular local variable? PHP › Functions & Scope | PHP | Functions & Scope | Intermediate |
| 16 | How can you store session data in a shared storage system like Redis or a database instead of the default local file storage, and why is this often necessary for applications running on multiple servers? PHP › Sessions & Cookies | PHP | Sessions & Cookies | Advanced |