To calculate program execution time, you can call the time() function at the beginning and end of the program, then calculate the difference between the two timestamps to get the program’s execution time.
Cache refreshing control: You can use the time() function to retrieve the current timestamp and then combine it with the cache expiration time to control cache refreshing.
Session management: The session management function can be implemented by using the time() function along with setting a session expiration time.
定时任务：使用time()函数来确定是否达到执行定时任务的条件。
Calculate time interval: You can use the time() function to get the timestamps of two time points, and then calculate the time interval.
Ranking list sorting: The time() function can be used as one of the sorting criteria, recording the time of user actions in a timestamp format to achieve the sorting function of the ranking list.
