LOCK FILE PHP for read then cannot be read?

Question

I am locking files but then when I read them I cannot, my code...

// ACQUIRE READ LOCK
if(flock($file, LOCK_SH)) {
// READ HASHES FILE
if($contents = file('haasdas.txt')) {
    // RELEASE READ LOCK
    flock($file, LOCK_UN);
} else {
            echo 'errrrrrorzzzer';
      }
}

What is going on here?

Answer 1

As the docs mention, flock() works not on a filename, but on a file descriptor:

$fd=fopen($filename,'rb');
while (!flock($fd,LOCK_SH)) usleep(500);
$fs=fstat($fd);
$contents=fread($fd,$fs['size']);
flock($fd,LOCK_UN);
fclose($fd);

error handling is left as an exercise to the reader ...