Mine

$stmt = '
UPDATE 
	`fjordvald`.`' . $this->year . '_' . $this->month . '` 
SET 
	`gg` = ' . $person['gg'] . ' 
WHERE 
	`gg`   = 0 AND 
	`stat` IN("2", "3") AND 
	`stk` LIKE "' . $person['stk'] . '%"
	' . ( !empty($person['lrk']) ? ' AND `lrk`  = ' . $person['lrk'] : '' ) . '
	' . ( !empty($person['pens']) ? ' AND `pens` = ' . $person['pens'] : '' ) . '
	' . ( !empty($person['trin']) ? ' AND `trin` = ' . $person['trin'] : '' ) . '
	' . ( !empty($person['komafgr']) ? ' AND IF(`kom` IN("157", "181"), "2", "1") = ' . $person['komafgr'] : '' ) . '
	' . ( !empty($person['forh']) ? $person['forh'] === 'A' ? ' AND IF(`kom` = "101", "4", IF(`kom` = "147", "5", `fomr`) ) IN("1", "2", "4", "5")' : ' AND IF(`kom` = "101", "4", IF(`kom` = "147", "5", `fomr`) ) = ' . $person['forh'] : '' );