SplFileObject::flock

(PHP 5 >= 5.1.0, PHP 7)

SplFileObject::flock — Portable file locking

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

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

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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.

wouldblock

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

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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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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.

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