SplFileObject::flock

(PHP 5 >= 5.1.0, PHP 7)

SplFileObject::flockPortable file locking

Beschreibung

public SplFileObject::flock ( int $operation [, int &$wouldblock ] ) : bool

Locks or unlocks the file in the same portable way as flock().

Parameter-Liste

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).

It is also possible to add LOCK_NB as a bitmask to one of the above operations, if flock() should not block during the locking attempt.

wouldblock

Set to TRUE if the lock would block (EWOULDBLOCK errno condition).

Rückgabewerte

Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.

Beispiele

Beispiel #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!";
}
?>

Siehe auch

  • flock() - Portables Datei-Sperr-Verfahren (advisory locking)