(PECL mongo >=0.9.0)
MongoGridFS::remove — Remove files and their chunks from the database
$criteria = array()
   [, array $options = array()
  ]] ) : bool|array
criteria
     The filename or criteria for which to search.
options
     
       An array of options for the remove operations executed against the
       chunks and files collections. See
       MongoCollection::remove() for documentation on these
       options.
      
   Returns an array containing the status of the removal (with respect to the
   files collection) if the "w" option is
   set. Otherwise, returns TRUE.
  
Fields in the status array are described in the documentation for MongoCollection::insert().
Throws MongoCursorException if the "w" option is set and the write fails.
Throws MongoCursorTimeoutException if the "w" option is set to a value greater than one and the operation takes longer than MongoCursor::$timeout milliseconds to complete.  This does not kill the operation on the server, it is a client-side timeout. The operation in MongoCollection::$wtimeout is milliseconds.