Interview Questions for PHP

Here are some interview questions that could be asked to assess the PHP knowledge and experience of a candidate with 5 years of experience:

• Can you explain the difference between PHP 5 and PHP 7? What are the notable improvements in PHP 7?
• Describe the different types of errors in PHP, and explain how you handle them effectively in your code.
• What are the differences between procedural programming and object-oriented programming in PHP? Can you provide examples of when to use each approach?
• Explain the concept of PHP sessions and how they are used to maintain state between multiple HTTP requests.
• How do you handle file uploads in PHP? Explain the necessary steps to validate and process an uploaded file.
• Describe what SQL injection is and how to prevent it in PHP applications.
• What are namespaces in PHP, and why are they important? How do you use namespaces to organize your code?
• Explain the concept of autoloading in PHP. How do you implement autoloading, and what are the benefits it provides?
• Can you describe the use of PHP frameworks in your development experience? Which frameworks have you worked with, and what are the advantages they offer?
• How do you ensure security in PHP applications? Discuss common security vulnerabilities and the measures you take to mitigate them.
• Explain the concept of caching in PHP. How do you implement caching in your applications to improve performance?
• Describe how you handle database operations in PHP. What are the different database libraries and ORM (Object-Relational Mapping) tools you have experience with?
• Can you explain the concept of RESTful APIs and how you build them using PHP? What are the essential components of a RESTful API?
• Discuss your experience with version control systems like Git and how you use them in your PHP development workflow.
• Can you provide an example of a complex PHP project you have worked on? Explain the architecture, design patterns, and any challenges you faced during its development.

Remember that these questions are meant to assess a candidate's knowledge and experience. It's important to tailor the questions to your specific requirements and consider adding questions based on your organization's technology stack and needs.

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