📊 PHP Performance MCQ Test

🟢 Basic Level

1. What is the main purpose of caching in PHP?

A. Increase database size
B. Reduce execution time
C. Increase server load
D. Slow down application

✅ Answer: B

2. Which of the following is an opcode cache?

A. Redis
B. Memcached
C. OPcache
D. MySQL

✅ Answer: C

3. Which function is faster?

A. print
B. echo
C. दोनों समान
D. None

✅ Answer: B

4. What does `isset()` check?

A. Variable is empty
B. Variable exists and not null
C. Variable is false
D. Variable is numeric

✅ Answer: B

5. Which is better for performance?

A. include
B. require
C. require_once
D. All same

✅ Answer: C

🟡 Intermediate Level

6. Which caching is fastest?

A. File caching
B. Database caching
C. Memory caching (Redis)
D. Browser caching

✅ Answer: C

7. What is the problem with this code?

for ($i = 0; $i < count($arr); $i++)

A. Syntax error
B. Infinite loop
C. Recalculates count each iteration
D. Nothing wrong

✅ Answer: C

8. Which improves DB performance?

A. More queries
B. Indexing
C. Nested loops
D. Large data fetch

✅ Answer: B

9. What does OPcache store?

A. Database queries
B. HTML output
C. Compiled PHP bytecode
D. CSS files

✅ Answer: C

10. Which is best for session storage?

A. File
B. Cookie
C. Redis
D. URL

✅ Answer: C

🔴 Advanced Level

11. What is N+1 query problem?

A. Too many loops
B. Queries inside loop
C. Syntax error
D. Memory leak

✅ Answer: B

12. Which tool is used for profiling PHP?

A. Git
B. Xdebug
C. Apache
D. Bootstrap

✅ Answer: B

13. What is PHP-FPM used for?

A. File storage
B. Fast request handling
C. Database connection
D. CSS optimization

✅ Answer: B

14. Which header improves performance?

A. Content-Type
B. Cache-Control
C. Authorization
D. Accept

✅ Answer: B

15. What does Gzip do?

A. Encrypt data
B. Compress response
C. Cache data
D. Execute faster

✅ Answer: B

🧠 Scenario-Based MCQs

16. Website is slow due to repeated DB queries. Solution?

A. Add more queries
B. Use caching
C. Remove database
D. Restart server

✅ Answer: B

17. High server load issue. Best fix?

A. Increase loops
B. Use CDN + caching
C. Disable PHP
D. Add HTML

✅ Answer: B

18. Large API response delay. What to do?

A. Increase response size
B. Use pagination
C. Add images
D. Remove JSON

✅ Answer: B

19. Memory limit exceeded. Fix?

A. Increase loops
B. Optimize code & unset variables
C. Add more variables
D. Ignore error

✅ Answer: B

20. Best way to improve PHP performance instantly?

A. Disable server
B. Enable OPcache
C. Add CSS
D. Use print

✅ Answer: B

🎯 Score Guide

18–20 → 🔥 Expert
14–17 → 🚀 Strong
10–13 → 👍 متوسط (Good)
<10 → 📘 Need Practice

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PHP Performance MCQ Test (with answers)