Summary of common PHP interview questions

This article mainly shares with you a summary of common PHP interview questions, mainly in the form of text, hoping to help everyone.

#1. Look at the resume and ask about the number of users, pv, throughput, related difficulties and solutions of some past projects

2. Database design experience, why table splitting? Database splitting?
What is the general amount of data to start splitting into tables? Database splitting? What is the purpose of database splitting? What is database vertical splitting? Horizontal splitting ? Partitioning, etc.? You can give examples
3. What are the database optimizations? What should you pay attention to?
4. What kind of caches will you encounter in web development? How to optimize them?
5. Give you 256M of memory, for 10G How to sort files (1 number per line of file)?
How to search for 10G files?
How to count the number of occurrences of each keyword in a 10G file?
6. If you are now the designer of 12306 train ticket booking, how should you design to satisfy people across the country in booking tickets?
7. If there are 100 million user visits, what is your server architecture? Users How to design the information storage plan?
8. If you are the technical team leader and the team you lead cannot complete the task progress, how should you solve it?
If you insert the task when the schedule is full, how should you ensure that the overall progress is completed? The progress will not be delayed?
If some engineers have not completed their scheduled tasks today, how should you solve it?
9. Talk about how to build a high-performance web site from your experience? What links are required? Steps? Each step What should we pay attention to, how to optimize, etc.?
10. Why should we separate the master and slave of the database?
11. How to deal with multi-server shared sessions?
12. For a 10G table, you use a PHP program to count a certain The number of times a field appears, the idea is?
13. Will you tell you an nginx log example, use the programming language you think is the best to count the top 10 URLs with http response time exceeding 1 second?
14. Here you go A mysql configuration file, use the programming language you think is the best to parse the file?
15. Given two paths a and b, write an algorithm or idea to calculate the gap between a and b and display the intersection of a and b ?
16. Give you a url, configure rewrite in nginx to specify a specific path?
17. What is the interpretation process of a php file? What are the general methods to speed up php? What can be used to improve the overall performance of php? Technology?
18. What is the difference between session and cookie life cycle? What is the difference between storage location?
19. What is the difference between require, include, require_once, and include_once? What is the difference between loading? If the program loads a PHP file on demand, how do you implement it?
20. Chrome is called multi-threaded, so what is the difference between multi-threading and multi-process?
21. PHP had a hash collision at the end of 2011. What is the principle of hash collision? How to fix it?
22. The web is not safe What are the factors? How to prevent them?
23. If two singly linked lists intersect, write an optimal algorithm to calculate the position of the intersection, and you can also explain the idea?
24. What if you are the technical team leader? How to improve team efficiency ?
25. What is nginx load balancing? If one of the servers hangs up, how to implement the alarm mechanism?
26. Without optimization, what is the general maximum number of connections for apache? What is the general maximum number of connections for nginx? Mysql Insert? select? update? delete per second?
27. What are the data types of mysql? How much storage space do they occupy?
28. nginx is set to cache js, css, pictures and other information. What is the implementation principle of caching?
29. How to improve the cache hit rate? How to granularize the cache?
30. What is the memory recycling mechanism of PHP?
31. I have asked all my questions. Do you have any questions for me?

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