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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 `TRUE`를, 실패할 경우 `FALSE`를 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

- flock() - Portable advisory file locking

SplFileObject::fgetss
SplFileObject::fpassthru
SplFileObject
PHP Manual