After installing phpstudy, I found that port 80 was occupied:
Enter the cmd interface, enter "netstat -ano" and press the Enter key. Information such as the port and program ID occupied by the program in the current computer will be displayed; the first item you see is: 0.0.0.0:80 This is port 80, which is tcp protocol, and the PID behind it is 4;
Open the task manager, win10 found the program with pid 4 in the detailed information, and found it to be system, but it could not be ended. Finally, it was found that it was occupied by sqlserver2008.