SplFileObject::flock
(PHP 5 >= 5.1.0)
SplFileObject::flock — Portable file locking
Descrição
public bool SplFileObject::flock ( int $operation [, int &$wouldblock ] )
Locks or unlocks the file in the same portable way as flock().
Parâmetros
- operation
-
operation is one of the following:
- LOCK_SH to acquire a shared lock (reader).
- LOCK_EX to acquire an exclusive lock (writer).
- LOCK_UN to release a lock (shared or exclusive).
- LOCK_NB to not block while locking (not supported on Windows).
- wouldblock
-
Set to TRUE if the lock would block (EWOULDBLOCK errno condition).
Valor Retornado
Retorna TRUE em caso de sucesso ou FALSE em falhas.
Exemplos
Exemplo #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!";
}
?>Veja Também
- flock() - Monitor de travamento de arquivos portátil
User Contributed Notes
digitalprecision at gmail dot com 24-Dec-2010 10:48
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.