Question

I am going to send mail through a PHP website. The client may customize the mail subject and I will get the post data in UTF-8. But when I send out an HTML e-mail using the PHP mail(),
I found that the subject does not show properly but the body does.

How do I send a chinese word in the PHP mail function?

Thanks.

Answer 1

You need to encode the subject according to how encoded-word is specified (see RFC 2047):

encoded-word = "=?" charset "?" encoding "?" encoded-text "?="

You can either use

• the Base64 encoding (base64_encode):

  'Subject: =?UTF-8?B?'.base64_encode($subject).'?='
  

  or

• the quoted-printable encoding (see RFC 2045, imap_8bit):

  'Subject: =?UTF-8?Q?'.imap_8bit($subject).'?='