[wp-trac] [WordPress Trac] #41750: Update PHPMailer to 6.0

[WordPress Trac]

#41750: Update PHPMailer to 6.0
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 Reporter:  Synchro                              |       Owner:
                                                 |  SergeyBiryukov
     Type:  enhancement                          |      Status:  accepted
 Priority:  normal                               |   Milestone:  Future
                                                 |  Release
Component:  External Libraries                   |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing needs-dev-   |     Focuses:
  note early                                     |
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Comment (by ayeshrajans):

 Please see an updated patch with a few more improvements
 ([https://github.com/Ayesh/wordpress-
 develop/compare/447bbd194c...9c01d307a2e66b10 patch list] compared to
 41750-7-obsolete.patch):

 1. Simplify `$phpmailer->addCustomHeader` to use single quotes to the
 double quotes don't need to be escaped:

 `$phpmailer->addCustomHeader( sprintf( 'Content-Type: %s; boundary="%s"',
 $content_type, $boundary ) );`

 as opposed to:

 `$phpmailer->addCustomHeader( sprintf( "Content-Type: %s;
 boundary=\"%s\"", $content_type, $boundary ) );`


 2. Add exception handling for other `$phpmailer->addCustomHeader` calls.
 This brings back the old behavior of silently handling invalid values.
 `$phpmailer->addAttachment` already has similar exception handling.


 3. Use `::class` constant in the deprecated `class-phpmailer.php` file.
 PHP 5.5 supports this, and can make the class names clickable in IDEs and
 helps static analyzers as well.


 **Tests**: [https://travis-ci.com/github/Ayesh/wordpress-
 develop/builds/162647249 passing]

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Ticket URL: <https://core.trac.wordpress.org/ticket/41750#comment:40>
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