PHP Interview Cheat Sheet

1. What is PHP and where is it commonly used?

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2. What does server-side scripting mean in PHP?

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3. What is the difference between echo and print?

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4. What are PHP variables and how are they declared?

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5. What are PHP data types?

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6. What is an associative array in PHP?

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7. What is the difference between == and === in PHP?

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8. What are PHP superglobal variables?

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9. What is the role of $_GET and $_POST?

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10. What is a session in PHP?

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11. What is a cookie in PHP?

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12. What is the include statement used for?

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13. What is the difference between include and require?

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14. What is form handling in PHP?

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15. What is the purpose of htmlspecialchars()?

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16. What is PDO in PHP?

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17. What is SQL injection and how do you prevent it in PHP?

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18. What is the use of isset() in PHP?

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19. What is empty() in PHP?

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20. How does PHP handle errors?

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21. What is the purpose of php.ini?

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22. What is file handling in PHP?

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23. What is the difference between single and double quotes in PHP?

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24. What is the purpose of the header() function?

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25. What is JSON encoding and decoding in PHP?

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26. What is the difference between GET and POST methods in PHP?

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27. What is PHP’s type juggling and how does it affect comparisons?

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28. What is the purpose of filter_var() in PHP?

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29. What are magic constants in PHP?

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30. What are magic methods in PHP?

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31. What is the difference between include_once and require_once?

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32. What is the purpose of session_start()?

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33. What is output buffering in PHP?

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34. What are PHP traits?

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35. What is the difference between public, private, and protected?

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36. How does PHP handle exceptions?

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37. What is the purpose of namespaces in PHP?

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38. What is autoloading in PHP?

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39. What is Composer in PHP?

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40. What is the difference between == and === when comparing arrays?

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41. What is the purpose of htmlentities()?

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42. How do you connect PHP with MySQL using PDO?

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43. What is the difference between mysqli and PDO?

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44. What is a callback function in PHP?

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45. What is the purpose of phpinfo()?

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46. What is the difference between require, include, require_once, and include_once in real project scenarios?

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47. What is the role of PHP’s garbage collection mechanism?

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48. What is the difference between session storage and token-based authentication?

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49. How does PHP handle file uploads and what security concerns exist?

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50. What is output escaping and why is it important in PHP apps?

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