/**
* @desc Alter the specified permissions bits
* @param mixed $vPermissions AclList (array) or simple permissions (int)
* @param int $iWhat Which permissions bit are involved
* @param string $sUid uid to check
* @param array $aGid groups to check
* @param bool $bSet set or remove
* @return bool success
* @access public
* @author Marc Groot Koerkamp
*/
function alterPermission(&$vPermission, $iWhat, $sUid, $aGid, $bSet = true)
{
$bResult = true;
if ($this->enable_acl) {
// use tree defaults if sUid/aGid are not supplied
if (!$sUid) {
$sUid = $this->uid;
}
if (!count($aGid)) {
$aGid = $this->gid;
}
if (!acl::alterMyPerm($vPermission, $iWhat, $sUid, $aGid, $bSet)) {
return false;
}
} else {
if ($bSet) {
$vPermission = ($vPermission ^ $iWhat) + ($vPermission & $iWhat);
} else {
$vPermission = ($vPermission | $iWhat) - $iWhat;
}
}
return $bResult;
}