Use of undefined constant INTL_IDNA_VARIANT_UTS46

[iatanasov77]

Q	A
Bug report?	yes
Feature request?	no
RFC?	no
How used?	Laravel
Swiftmailer version	6.1.0
PHP version	7.1.17

Example

I send email by smtp transport with SwiftMailer.
Mail::send( 'emails.contact', $data,
function ( $message )
{
$message->to( 'noreply@mysite.bg' );
$message->subject( 'Mail Subject' );
}
);
Thе code worked before it was updated from 6.0.2 to 6.1.0 version

Throws an Exception

[2018-05-17 06:06:56] production.ERROR: Use of undefined constant INTL_IDNA_VARIANT_UTS46 - assumed 'INTL_IDNA_VARIANT_UTS46' {"exception":"[object] (ErrorException(code: 0): Use of undefined constant INTL_IDNA_VARIANT_UTS46 - assumed 'INTL_IDNA_VARIANT_UTS46' at /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/AddressEncoder/IdnAddressEncoder.php:55)
[stacktrace]
#0 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/AddressEncoder/IdnAddressEncoder.php(55): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8, 'Use of undefine...', '/home/lafkabgu/...', 55, Array)
#1 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/AddressEncoder/IdnAddressEncoder.php(43): Swift_AddressEncoder_IdnAddressEncoder->idnToAscii('lafka.bg')
#2 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(377): Swift_AddressEncoder_IdnAddressEncoder->encodeString('noreply@lafka.b...')
#3 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(478): Swift_Transport_EsmtpTransport->doMailFromCommand('noreply@lafka.b...')
#4 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(507): Swift_Transport_AbstractSmtpTransport->doMailTransaction(Object(Swift_Message), 'noreply@lafka.b...', Array, Array)
#5 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(205): Swift_Transport_AbstractSmtpTransport->sendTo(Object(Swift_Message), 'noreply@lafka.b...', Array, Array)
#6 /home/lafkabgu/Lafka_2017/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(70): Swift_Transport_AbstractSmtpTransport->send(Object(Swift_Message), Array)
#7 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php(451): Swift_Mailer->send(Object(Swift_Message), Array)
#8 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php(235): Illuminate\Mail\Mailer->sendSwiftMessage(Object(Swift_Message))
#9 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(221): Illuminate\Mail\Mailer->send('emails.contact....', Array, Object(Closure))
#10 /home/lafkabgu/Lafka_2017/app/Http/Controllers/Lafka/ContactPageController.php(33): Illuminate\Support\Facades\Facade::__callStatic('send', Array)
#11 [internal function]: App\Http\Controllers\Lafka\ContactPageController->sendMail(Object(App\Http\Requests\ContactFormRequest))
#12 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): call_user_func_array(Array, Array)
#13 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(45): Illuminate\Routing\Controller->callAction('sendMail', Array)
#14 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Route.php(212): Illuminate\Routing\ControllerDispatcher->dispatch(Object(Illuminate\Routing\Route), Object(App\Http\Controllers\Lafka\ContactPageController), 'sendMail')
#15 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Route.php(169): Illuminate\Routing\Route->runController()
#16 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Router.php(658): Illuminate\Routing\Route->run()
#17 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(30): Illuminate\Routing\Router->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#18 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(41): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#19 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Routing\Middleware\SubstituteBindings->handle(Object(Illuminate\Http\Request), Object(Closure))
#20 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#21 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(67): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#22 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle(Object(Illuminate\Http\Request), Object(Closure))
#23 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#24 /home/lafkabgu/Lafka_2017/app/Http/Middleware/OrmAuthorize.php(62): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#25 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): App\Http\Middleware\OrmAuthorize->handle(Object(Illuminate\Http\Request), Object(Closure))
#26 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#27 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Session/Middleware/AuthenticateSession.php(39): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#28 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Session\Middleware\AuthenticateSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#29 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#30 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#31 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\View\Middleware\ShareErrorsFromSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#32 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#33 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(63): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#34 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Session\Middleware\StartSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#35 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#36 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#37 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle(Object(Illuminate\Http\Request), Object(Closure))
#38 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#39 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(59): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#40 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Cookie\Middleware\EncryptCookies->handle(Object(Illuminate\Http\Request), Object(Closure))
#41 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#42 /home/lafkabgu/Lafka_2017/app/Http/Middleware/OrmForceSSL.php(25): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#43 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): App\Http\Middleware\OrmForceSSL->handle(Object(Illuminate\Http\Request), Object(Closure))
#44 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#45 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(102): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#46 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Router.php(660): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#47 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Router.php(635): Illuminate\Routing\Router->runRouteWithinStack(Object(Illuminate\Routing\Route), Object(Illuminate\Http\Request))
#48 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Router.php(601): Illuminate\Routing\Router->runRoute(Object(Illuminate\Http\Request), Object(Illuminate\Routing\Route))
#49 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Router.php(590): Illuminate\Routing\Router->dispatchToRoute(Object(Illuminate\Http\Request))
#50 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(176): Illuminate\Routing\Router->dispatch(Object(Illuminate\Http\Request))
#51 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(30): Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}(Object(Illuminate\Http\Request))
#52 /home/lafkabgu/Lafka_2017/app/Http/Middleware/OrmMultilanguage.php(34): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#53 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): App\Http\Middleware\OrmMultilanguage->handle(Object(Illuminate\Http\Request), Object(Closure))
#54 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#55 /home/lafkabgu/Lafka_2017/app/Http/Middleware/BuildNavigation.php(33): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#56 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): App\Http\Middleware\BuildNavigation->handle(Object(Illuminate\Http\Request), Object(Closure))
#57 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#58 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(30): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#59 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle(Object(Illuminate\Http\Request), Object(Closure))
#60 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#61 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(30): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#62 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle(Object(Illuminate\Http\Request), Object(Closure))
#63 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#64 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#65 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Foundation\Http\Middleware\ValidatePostSize->handle(Object(Illuminate\Http\Request), Object(Closure))
#66 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#67 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php(46): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#68 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode->handle(Object(Illuminate\Http\Request), Object(Closure))
#69 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#70 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(102): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#71 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(151): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#72 /home/lafkabgu/Lafka_2017/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(116): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter(Object(Illuminate\Http\Request))
#73 /home/lafkabgu/Lafka_2017/public/index.php(53): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request))
#74 /home/lafkabgu/public_html/index.php(2): require('/home/lafkabgu/...')
#75 {main}
"}

[Seb33300]

A solution may be to disable the php extension and use the symfony polyfill instead:
https://github.com/symfony/polyfill-intl-idn