我对文件有写权限，但我不能使用“unlink（）”函数删除它

Question

I've Googled around a bit, and can't find any answer that works for me. I'm trying to unlink a file, but nothing happens and no errors appear (display_errors() stopped the page from loading). The code is below. Thanks!

 chdir("/var/www/lib.techtri.be/");
 unlink("/var/www/lib.techtri.be/R1Count.txt");

Edit: I know the chdir isn't needed, that's just for the later parts in the file.

Answer 1

You can only delete a file if you also have write permission on the directory containing it.

% mkdir foo
% touch foo/bar
% chmod u-w foo
% rm foo/bar
rm foo/bar: Permission denied