Use PHP to decode POP3 emails (1)_PHP tutorial

A preliminary understanding of the source files of emails
(Author: Chen Junqing, October 24, 2000 15:08)
This article briefly explains the principles of receiving emails through the POP3 protocol and decoding MIME emails; for receiving and MIME decoding, it provides Provides two practical PHP classes and provides usage examples. It is divided into two parts: mail collection and MIME decoding. We have already introduced you to the collection of emails, now let us introduce you to the decoding part of this article.
In the previous article, we have completed an example of using PHP to receive emails through POP3. However, when using this class, I believe you have seen that many emails received are a bunch of garbled characters, and you can’t even read them. don't know! Yes. Most of today's emails have been encoded and require a decoding process before they can be turned into the text, pictures, or other attachments we are used to.
The source file of the email
First, let’s take a look at the source file of a simple email: (In Foxmail, select the email and click “View Source File” to see something like this)
From:
To:
Subject: =?gb2312?B?xOO6w6Oh?=
Date: Sun, 8 Oct 2000 20: 28:45 +0800
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0007_01C03166.5B1E9510"
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 5.00.2919.6700

------=_NextPart_000_0007_01C03166.5B1E9510
Content-Type: text/plain;
charset="gb2312"
Content-Transfer-Encoding: base64
w7vT0MLSwuuwyaO/DQo =
------=_NextPart_000_0007_01C03166.5B1E9510
Content-Type: text/html;
charset="gb2312"
Content-Transfer-Encoding: base64
PCFET0NUWVBFIEhUTUwgUF VCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv
　L0VOIj4NCjxIVE1MPjxIRUFEPg0KPE1FVEEgY29udGVudD0idGV4dC9odG1sOyBjaGFyc2V0PWdi
MjMxMiIgaHR0cC1lcXVpdj1Db250ZW50LVR5cGU+DQo8TUVUQSBjb250ZW50PSJNU0hUTUwgNS4w
TEU+DQo8L0hFQUQ+DQo8Qk9E
　WSBiZ0NvbG9yPSNmZmZmZmY+DQo8RElWPjxGT05UIHNpemU9Mj7Du9PQwtLC67DJo788L0ZPTlQ+

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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629293.htmlTechArticleInitial understanding of the source file of the email (Author: Chen Junqing, October 24, 2000 15:08) This article briefly explains The principle of receiving emails and decoding MIME emails through the POP3 protocol; for receiving and MIM...