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A company's PHP interview questions-PHP source code

Source: Internet
Author: User
Tags how to prevent sql injection
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A company's PHP interview questions 
1. what is the output content? 'Echo count ("hello"); '2. what can I explain? 'Private public protected' 3. What is the difference between 'strtotime ("-1 day") strtotime ("yesterday? '4. 'What is output by isset (false? = And =? '5. what is the role of cdn? 6. what is the last 100 lines of a file output in bash? The last 100 lines of PHP native output files? 7. there is a million user table. Should I create a table structure that is mutual friend? 8. What are the application scenarios of message queue? 9. echo PHP_SAPI; what is output? 10. how to prevent SQL injection and XSS attacks?

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