PHP, a crucial language for web development since the mid-1990s, remains significant despite the emergence of new languages and frameworks. To demonstrate expertise in PHP, one should be able to answer eight key questions. These include setting up a PHP development environment, understanding the difference between == and === operators, using Traits for method sharing, managing sessions, and utilizing namespaces. Additionally, familiarity with closures, templates, and best practices for file inclusion is essential. By mastering these concepts, developers can write more efficient code and improve their overall skills.

Source: https://dev.to/gitter4coding/8-key-questions-that-every-php-expert-should-answer-24jo