If file lock is not available, flock( ) will return immediately with false rather than wait for a lock to become available. : flock « File Directory « PHP

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PHP » File Directory » flock

If file lock is not available, flock( ) will return immediately with false rather than wait for a lock to become available.


 

<?

    $fp = fopen("foo.txt", "w");

    if (flock($fp, LOCK_EX | LOCK_NB)) {

            echo "Got lock!\n";

            sleep(10);

            flock($fp, LOCK_UN);

    } else {

            print "Could not get lock!\n";

    }

?>

Related examples in the same category

1.	Locking Files with flock( )
2.	Using advisory file locking
3.	The file locking mechanism in PHP makes processes queue up for their locks by default

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