$changesets : array
The changesets whose status you'd like to check.
Check the status of the supplied changesets, letting you know what revisions are currently applied in the database along with what revisions are available but not yet applied.
getAvailableChangesBySet() : array
Get an array of status information following a call to execute. Will follow this format:
array( 'changeset-1' => array( 'current' => 8, 'files' => array( 9 => '00009-new-revision.sql', 10 => '00010-new-revision.sql' ) ), 'changeset-2' => array( 'current' => 8, 'files' => array() ), )