File Directory Php

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  4. 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";
    }
?>