SplFileObject::flock
(PHP 5 >= 5.1.0)
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 -
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 (not supported on Windows).
-
-
wouldblock -
Set to
TRUEif 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!";
}
?>
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