php - copy，rename和move_uploaded_file之间的差异

Question

Are there differences when I use that functions? Why should I use one instead of the other one...

Answer 1

• copy() copies the file - you now have 2 files, and for large files, this can take very long
• rename() changes the file's name, which can mean moving it between directories.
• move_uploaded_file() is basically the same as rename() , but it will only work on files that have been uploaded via PHP's upload mechanism. This is a security feature that prevents users from tricking your script into showing them security-relevant data.

In the future, I suggest looking up such information in the PHP Manual yourself.

Answer 2

I found this in the manual of move_uploaded_file() :

Florian S. in H. an der E. [.de] at 17-Aug-2008 09:02

move_uploaded_file (on my setup) always makes files 0600 ( rw- --- --- ) and owned by the user running the webserver (owner AND group). Even though the directory has a sticky bit set to the group permissions! I couldn't find any settings to change this via php.ini or even using umask() .

I want my regular user on the server to be able to tar cjf the directory .. which would fail on files totally owned by the webserver-process-user; the copy(from, to) function obeys the sticky-bit though!

so it seems like copy and rename do a slightly different work.