note 127484 added to splfileobject.flock

@digitalprecision What you said is not completely true, ftruncate(0); is needed if there was a write to the file before the lock is acquired. You also may need fseek(0); to move back the file pointer to the beginning of the file <?php $file = new SplFileObject("/tmp/lock.txt", "w"); $file->fwrite("xxxxx"); // write something before the lock is acquired sleep(5); // wait for 5 seconds if ($file->flock(LOCK_EX)) { // do an exclusive lock $file->fwrite("Write something here\n"); $file->flock(LOCK_UN); // release the lock } else { echo "Couldn't get the lock!"; } ?> "lock.txt" content: xxxxxWrite something here ---- Server IP: 45.112.84.4 Probable Submitter: 45.91.157.133 (proxied: 2a02:cb80:403b:8a2e:1d29:beea:683a:e641) ---- Manual Page -- https://php.net/manual/en/splfileobject.flock.php Edit -- https://main.php.net/note/edit/127484 Del: integrated -- https://main.php.net/note/delete/127484/integrated Del: useless -- https://main.php.net/note/delete/127484/useless Del: bad code -- https://main.php.net/note/delete/127484/bad+code Del: spam -- https://main.php.net/note/delete/127484/spam Del: non-english -- https://main.php.net/note/delete/127484/non-english Del: in docs -- https://main.php.net/note/delete/127484/in+docs Del: other reasons-- https://main.php.net/note/delete/127484 Reject -- https://main.php.net/note/reject/127484 Search -- https://main.php.net/manage/user-notes.php