[wp-trac] [WordPress Trac] #39775: wp_mail miss send Content-Type with boundary when array header does not have other custom headers

[WordPress Trac]

#39775: wp_mail miss send Content-Type with boundary when array header does not
have other custom headers
--------------------------+-----------------------------
 Reporter:  kn007         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Mail          |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 It's a PR send in github. https://github.com/WordPress/WordPress/pull/273

 Fix empty charset in line 436.
 Before:
 `Content-Type: multipart/alternative; charset=`
 After:
 `Content-Type: multipart/alternative; charset=UTF-8`
 -------------

 fix `$headers[] = "Content-Type: multipart/alternative;
 boundary=\"$boundary\"";` not send when not other headers.

 Test Code:

 {{{#!php
 <?php
 $boundary = md5( uniqid() . microtime() );
 $to = 'wordpress at wordpress.org';
 $subject = 'TEST';
 $headers[] = "From: Wordpress <wordpress at wordpress.org>";
 $headers[] = "Content-Type: multipart/alternative;
 boundary=\"$boundary\"";
 $body  = "--$boundary\r\n" .
          "Content-Type: text/plain; charset=UTF-8\r\n";
 $body .= 'test';
 $body .= "--$boundary\r\n" .
          "Content-Type: text/html; charset=UTF-8\r\n";
 $body .= '<div>test</div>';
 wp_mail( $to, $subject, $body, $headers );
 }}}


 Before:
 [[Image(https://cloud.githubusercontent.com/assets/6196903/22583305
 /a84c5f1c-ea26-11e6-8718-2bde99d20484.png)]]

 After:
 [[Image(https://cloud.githubusercontent.com/assets/6196903/22583326/c4055362-ea26-11e6-8890-1da8fac8552e.png)]]


 I could search some issue for this, like
 http://wordpress.stackexchange.com/questions/191923/sending-multipart-
 text-html-emails-via-wp-mail-will-likely-get-your-domain-b
 https://wordpress.org/support/topic/using-wp_mail-with-php-generated-
 attachments/

 but still have same problem here.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39775>
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