src/Option.php
public static function none() {
        if( self::$empty === null ) self::$empty = new Option(null);
        return self::$empty;
    }
public static function none() {
        if( self::$empty === null ) self::$empty = new Option(null);
        return self::$empty;
    }
public static function none ( ) { if ( self :: $ empty === null ) self :: $ empty = new Option ( null ) ; return self :: $ empty ; }
Get an empty option
Get an empty option