The flock() function locks or releases a file.
This function returns TRUE on success or FALSE on failure.
Parameter | Description |
---|---|
file | Required. Specifies an open file to lock or release |
lock | Required. Specifies what kind of lock to use. Possible values:
|
block | Optional. Set to 1 to block other processes while locking |
Note: These locks only apply to the current PHP process. Other processes can modify or delete a PHP-locked file if permissions allow.
Note: flock() is mandatory under Windows.
Tip: The lock is released also by fclose(), which is called automatically when script is finished.