note 35978 deleted from function.link by didou

Note Submitter: kop@meme.com ---- See also:unlink(). On a Unix system the idiom for performing an atomic update to a file, an update where the system will either see a new file or an old file but never an intermediate, partially written file, is: $file = 'foo'; $tmp = $file . '.' . uniqid('', TRUE); // on same partition as $file // Read $file. // Write new contents into $tmp. link($tmp, $file); // Deletes old $file. unlink($tmp); // Cleanup, delete $tmp. Note: To avoid race conditions due to concurrent access always use flock() on $file.