SplFileObject::flock
(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::flock — Portable file locking
Description
public bool SplFileObject::flock ( int $operation [, int &$wouldblock ] )Locks or unlocks the file in the same portable way as flock().
Parameters
operation
operation is 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 TRUE if the lock would block (EWOULDBLOCK errno condition).
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #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!";
}
?>Changelog
Version | Description |
|---|---|
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. |
See Also
- flock() - Portable advisory file locking
← SplFileObject::fgetss
SplFileObject::fpassthru →
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