Not long ago I started receiving this strange error with mail sending in my Laravel application, error is:
ErrorException in EsmtpTransport.php line 55:
Argument 1 passed to Swift_Transport_EsmtpTransport::__construct() must implement interface Swift_Transport_IoBuffer, none given
Interesting thing is that my mailing system worked just fine for about a year, nothing has been updated (just server and domain paid again few weeks back), so I presume that code isn't the problem, I double checked information in mail authentication system, those are right too.
I followed exception stack trace, and found that in Swift_SmtpTransport::__construct() parameters are sent right, but from there Swift_EsmtpTransport::__construct() is called without parameters (which is actually error shown)
Also I updated all my libraries (with "composer update" command). I have no idea what can be wrong, and couldn't find anything that helps online, so any help will be great
Current versions are:
--- Edit ---
I found somewhere that this is some kind of loading (Dependency Injection) problem, so I executed this line of code:
var_dump(Swift_DependencyContainer::getInstance()->createDependenciesFor('transport.smtp'));
And got this as result array(0) { }
If anyone is interested, I found answer (with friends help). Problem is incompatibility with PHP version, apparently SwiftMailer library doesn't work on newer versions of PHP (>5.5.9, maybe few versions up, not sure from which version it start failing).
Fail is because of some auto-loading conflicts. Solution to this problem is reverting from lazy load to preload, that will slow down a little bit response time, but in most cases you won't even notice that (in my case, I don't see any decline in performance).
Concrete solution:
Find %APP%/vendor/swiftmailer/swiftmailer/lib/swift_requied.php and change it to look like this
<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/*
* Autoloader and dependency injection initialization for Swift Mailer.
*/
if (class_exists('Swift', false)) {
return;
}
// Load Swift utility class
require __DIR__.'/classes/Swift.php';
if (!function_exists('_swiftmailer_init')) {
function _swiftmailer_init()
{
require __DIR__.'/swift_init.php';
}
}
// Start the autoloader and lazy-load the init script to set up dependency injection
// Swift::registerAutoload('_swiftmailer_init');
_swiftmailer_init();
Difference is in last line, Swift::registerAutoload('_swiftmailer_init'); is commented out, and _swiftmailer_init method is called directly.
Hope this helps someone, because I lost about 2 days trying to fix this.