两个用户同时写入文件？ （PHP / file_put_contents）

Question

If I write data to a file via file_put_contents with the FILE_APPEND flag set and two users submit data at the same time, will it append regardless, or is there a chance one entry will be overwritten?

If I set the LOCK_EX flag, will the second submission wait for the first submission to complete, or is the data lost when an exclusive lock can't be obtained?

How does PHP generally handle that? I'm running version 5.2.9. if that matters.

Thanks, Ryan

Answer 1

you could also check the flock function to implement proper locking (not based on the while / sleep trick)