Respect\Validation有值才驗證怎么寫? 為空不驗證
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沒看到
http://www.wtbis.cn/doc/webman/components/validation.html#Validator%20%E5%8A%9F%E8%83%BD%E6%8C%87%E5%8D%97
$data = v::input( $param, [ 'name' => v::length(2, 20)->setName('姓名'), 'mobile' => v::length(11)->setName('手機'), 'email' => v::NullType()->email()->setName('郵箱'), ] ); email有值才驗證,應(yīng)該怎么寫?