imap_fetchbody 与 Gmail api 获取方法

Question

return格式与htmlimap_fetchbody vs Gmail api GET方法不同。

我将电子邮件写入一个文件，然后重新导入 Thunderbird。 imap_fetchbody 的书面电子邮件被加载到 Thunderbird 而没有填充问题，而同一电子邮件 return 由 API 有填充问题。

我看到的最大区别是 3D。

这里有几行来自 imap_fetchbody:

<html lang=3Den><head><meta content=3D"date=3Dno" name=3D"format-detection"=
><meta content=3D"email=3Dno" name=3D"format-detection"><style>.awl a {colo=
r: #FFFFFF; text-decoration: none;}.abml a {color: #000000; font-family: Ro=
boto-Medium,Helvetica,Arial,sans-serif; font-weight: bold; text-decoration:=
 none;}.adgl a {color: rgba(0, 0, 0, 0.87); text-decoration: none;}.afal a =
{color: #b0b0b0; text-decoration: none;}@media screen and (min-width: 600px=
) {.v2sp {padding: 6px 30px 0px;} .v2rsp {padding: 0px 10px;}}</style></hea=
d>

还有来自GMAIL api GET方法的几行：

<html lang=en><head><meta content="date=no" name="format-detection"><meta 
 content="email=no" name="format-detection"><style>.awl a {color: #FFFFFF; 
 text-decoration: none;}.abml a {color: #000000; font-family: Roboto-
 Medium,Helvetica,Arial,sans-serif; font-weight: bold; text-decoration: 
 none;}.adgl a {color: rgba(0, 0, 0, 0.87); text-decoration: none;}.afal a 
 {color: #b0b0b0; text-decoration: none;}@media screen and (min-width: 
 600px) {.v2sp {padding: 6px 30px 0px;} .v2rsp {padding: 0px 10px;}}</style> 
 </head>`

虽然 Gmail api GET 方法 returns base64 encode 我按以下方式转换的版本：

function decode($data)
{
    return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
}

两者之间到底有什么区别，为什么会有区别？

Screen shot of the mail fetched through gmail api

Screen shot of the mail fetched through imap_fetchbody

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谢谢

Answer 1

两者的区别在于imap_fetchbody returns:

It's quoted-printable text, probably the result of passing through a "dumb" mail client. = is used to encode/escape unprintable/metacharacters, much like &...; is used in HTML. =3d is the quoted-printable representation of an =: 3d hex = 61 ascii = equals sign.

参考：imap_fetchbody HTML with strange chars

虽然 Gmail api GET 方法 returns base64_encoded 需要 decoded 的字符串。我们可以通过以下方式添加相同的 quoted-printable 效果：

quoted_printable_encode($string)

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