不可能。您可以同时执行这两项操作，但可能没有单行操作那么理想：

$verify = (empty($var)) ? \'current_value\' : $var;
checked( $verify, $current );

function better_checked($check, $current, $echo = true) {

     $result = \' checked="checked"\';

     if ( ( $check != \'\' && $current != \'\' ) && ( (string) $check !== (string) $current ) )
          $result = \'\';

     if ($echo)
          echo $result;

     return $result;

}