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contributions/db.tristate/lib/helpers/tristate.cls.php

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<?php
/**
 * Provides tristate logic
 * 
 * @since 0.5.1
 * 
 * @author Gerd Riesselmann
 * @ingroup Tristate
 */
class Tristate {
        const YES = 'TRUE';
        const NO = 'FALSE';
        const UNKOWN = 'UNKNOWN';
        
        /**
         * Returns possible states as associative array with DB vlaue as key and localized display value as value
         *  
         * @return array
         */
        public static function get_states() {
                return array(
                        self::YES => tr(self::YES, 'tristate'),
                        self::NO => tr(self::NO, 'tristate'),
                        self::UNKOWN => tr(self::UNKOWN, 'tristate')            
                );
        }
        
        /**
         * Depending on $tristate returns of of the values $yes, $no, or $unkown
         * 
         * @param string $tristate Tristate value
         * @param mixed $yes Value to return if $tristate is Tristate::YES
         * @param mixed $no Value to return if $tristate is Tristate::NO
         * @param mixed $unknown Value to return if $tristate is Tristate::UNKOWN
         * @return mixed
         */
        public static function resolve($tristate, $yes, $no, $unkown) {
                switch ($tristate) {
                        case self::YES:
                                return $yes;
                        case self::NO:
                                return $no;
                        default:
                                return $unkown;
                }
        } 
}

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