note 37014 deleted from function.flock by danbrown

Note Submitter: bret at alliances dot org ---- A poster above (below?) has the right idea with writing to a tempory file, then copying. However, achieving the 'right' to use the temp file in the first place is still a race condition issue: if (file_exists($temp_filename)) { $fd = fopen ($temp_filename, 'w'); } is still wrong, there's still a race condition between checking to whether the temp file exists and creating it. Using the 'x' option for opening is a way to avoid this. With the 'x' option chosen, the fopen will fail (returning FALSE) if the file already exists. $fd = fopen ($tmp, 'x'); if ($blocking == 1) { while ($fd === FALSE) { clearstatcache(); usleep(rand(5,70)); $fd = fopen ($tmp, 'x'); } }