According to the teacher's code, a syntax error occurred: unexpected 'return' (T_RETURN)

Question

My PHP version is 5.5.38. Baidu on the Internet said to switch the PHP version

Answer 1

Test code

Answer 2

Test and Sysbd codes are as follows

Answer 3

Where is the code? There is no code. What can you say?

Answer 4

Where is the code?