For the record, the example given here has an explicit command to truncate the file, however with a 'write mode' of 'w', it will do this for you automatically, so the truncate call is not needed.
SplFileObject::flock
(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::flock — Portable file locking
Opis
public SplFileObject::flock
( int
$operation
[, int &$wouldblock
] ) : boolLocks or unlocks the file in the same portable way as flock().
Parametry
-
operation -
operationis one of the following:-
LOCK_SHto acquire a shared lock (reader). -
LOCK_EXto acquire an exclusive lock (writer). -
LOCK_UNto release a lock (shared or exclusive). -
LOCK_NBto not block while locking.
-
-
wouldblock -
Set to
TRUEif the lock would block (EWOULDBLOCK errno condition).
Zwracane wartości
Zwraca TRUE w przypadku powodzenia, FALSE w
przypadku błędu.
Przykłady
Przykład #1 SplFileObject::flock() example
<?php
$file = new SplFileObject("/tmp/lock.txt", "w");
if ($file->flock(LOCK_EX)) { // do an exclusive lock
$file->ftruncate(0); // truncate file
$file->fwrite("Write something here\n");
$file->flock(LOCK_UN); // release the lock
} else {
echo "Couldn't get the lock!";
}
?>
Rejestr zmian
| Wersja | Opis |
|---|---|
| 5.5.22, 5.6.6 |
Added support for the wouldblock parameter on
Windows.
|
| 5.3.2 | The automatic unlocking when the file's resource handle is closed was removed. Unlocking now always has to be done manually. |
add a note
User Contributed Notes 1 note
digitalprecision at gmail dot com ¶
13 years ago
