SplFileObject
PHP Manual

SplFileObject::flock

(PHP 5 >= 5.1.0)

SplFileObject::flock — Portable file locking

설명

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

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

인수

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 (not supported on Windows).

wouldblock

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

반환값

성공할 경우 TRUE를, 실패할 경우 FALSE를 반환합니다.

예제

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!";
}
?>

참고

SplFileObject
PHP Manual