#32160 [Opn->Ver]: Copying a file into itself leads to data loss

ID: 32160 Updated by: sniper@php.net Reported By: chernyshevsky at hotmail dot com -Status: Open +Status: Verified Bug Type: Filesystem function related -Operating System: Win32/Linux +Operating System: * -PHP Version: 4.3.10 +PHP Version: 4CVS, 5CVS (2005-02-02) Previous Comments: ------------------------------------------------------------------------ [2005-03-02 03:20:26] chernyshevsky at hotmail dot com Description: ------------ Copying a file into itself causes the source file to be truncate to 0 bytes. copy("test", "test"); // test.txt -> 0 You can't avoid this problem just by comparing the filenames, since one could be a symlink pointing to the other. The following would destroy test1 if test2 is a link to test1: copy("test1", "test2"); Reproduce code: --------------- copy("test", "test"); Expected result: ---------------- Nothing happens or a file open error. Actual result: -------------- Contents in source file is lost. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=32160&edit=1