Create a flag link for a user:
<?php
print flag_create_link('user_flagname', $user_uid);
?>
Get Flag of a Type and see if it is flagged for a node and not the number of times it got flagged.
<?php
$flag = flag_get_flag('bookmarks') or die('no "bookmarks" flag defined');
if ($flag->is_flagged($node->nid)) {
print "This node is bookmarked!";
}
print "The number of people who voted for this proposal:";
print $flag->get_count($node->nid); //
?>
Flagging or Unflagging an item:
You use the $flag->flag() method to either flag or unflag an item. Example:
<?php
$flag = flag_get_flag('bookmarks') or die('no "bookmarks" flag defined');
// Flag node #456:
$flag->flag('flag', 456);
// Unflag node #456:
$flag->flag('unflag', 456);
?>
--
Source:
https://drupal.org/node/1748148 : Awesome info