Written test questions that may appear in the one-year PHP work experience interview

1. Given a string, such as "ABCDEFG", reverse it recursively.

2. Write a sorting algorithm, which can be bubble sorting or quick sorting. Assume that the sorted object is a one-dimensional data.

3. How to understand Unicode encoding and utf-8 encoding.

4. Write two regular expressions that match email addresses and URLs, similar to the following:

   a) Email: user_name.first@example.com.cn

b) url: http//www.example.com/user.php?uid=100

5. Write out more than 10 Commonly used Linux commands you know and their functions are briefly explained.

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