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 →
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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