FLOCK
Portable advisory file locking
SYNTAX
flock ( resource $handle , int $operation [, int &$wouldblock ] ) : bool
PARAMETERS
handle
A file system pointer resource that is typically created using fopen().
operation
| LOCK_SH | acquire a shared lock (reader) |
| LOCK_EX | acquire an exclusive lock (writer) |
| LOCK_UN | release a lock (shared or exclusive) |
| LOCK_NB | add as a bitmask to one of the above operations if you don't want flock() to block while locking |
wouldblock
The optional third argument is set to 1 if the lock would block (EWOULDBLOCK errno condition).
RETURN
Returns TRUE on success or FALSE on failure.
EXAMPLES
HANDLE OPERATION | LOCK_SH
Hello
HANDLE OPERATION | LOCK_EX
Hello
HANDLE OPERATION | LOCK_NB
Hello
WOULDBLOCK
Hello