Replace error handler with error_get_last() function

[weierophinney]

Hi, guys.

I just found that mail() function does not generate the proper error that can be handled by handleMailErrors() method ("Temporary error handler for PHP native mail()" as pointed in the phpdoc). I have an msmtp as email agent with following settings in php.ini:

sendmail_path = "/usr/bin/msmtp -C /etc/.msmtp.fpm --logfile /var/log/msmtp.log --read-envelope-from -a gmail -t"

I have an error in \Zend\Mail\Transport\Sendmail::mailHandler if

$parameters = " -f'[email protected]'";

in

$result = mail($to, $subject, $message, $headers, $parameters);

As I see, there is a conflict between --read-envelope-from option of msmtp and -f'[email protected]' parameter of mail function. So, mail function returns false in this case.

But this code does not handle the error as expected. The breakpoint in handleMailErrors method does not activated when error occurs (I have PHP 7.2.19 & PHPStorm 2019.1.3).

I found that error_get_last() function may help in this case.

In addition I think we should not throw an exception if $result is true.

So, I suppose, the final code for mailHandler should be the following:

public function mailHandler($to, $subject, $message, $headers, $parameters)
{
    if ($parameters === null) {
        $result = mail($to, $subject, $message, $headers);
    } else {
        $result = mail($to, $subject, $message, $headers, $parameters);
    }

    if (!$result) {
        $errstr = error_get_last()['message'];
        if (empty($errstr)) {
            $errstr = 'Unknown error';
        }
        throw new Exception\RuntimeException('Unable to send mail: ' . $errstr);
    }
}

Sorry, my qualification is not enough to complete all items you want to see here (regression test, CHANGELOG.md, etc.). But I hope my point of view may be useful.

Have a good day!

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Originally posted by @flancer64 at zendframework/zend-mail#229