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<a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.2. Uuencode</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Encode & Decode</th><td width="20%" align="right"> <a accesskey="n" href="quoted-printable.html">Next</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="uuencode"></a>2.2. Uuencode</h2></div></div></div>

<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="/graphics/note.png" /></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>uuencode不是MIME标准</p></td></tr></table></div>

<p>application/x-uuencode</p>

<p>Uuencode 是将二进制文件以文本文件方式进行编码表示、以利于基于文本传输环境中进行二进制文件的传输/交换的编码方法之一，在邮件系统/二进制新闻组中使用频率比较高，经常用于附件二进制文件。</p>

<p>这种编码的特征是：每一行开头用“M”标志。 </p>

<p>Uuencode的算法很简单，编码时它将3个字符顺序放入一个 24 位的缓冲区，缺字符的地方补零，然后将缓冲区截断成为 4 个部分，高位在先，每个部分 6 位，用下面的64个字符重新表示：</p>

<br />

"`!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_"<br />

<br />

</p></div>

<p>解码时它将4个字符分别转换为4个6位字符后，截取有用的后六位放入一个 24 位的缓冲区，即得3个二进制代码。</p>

<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="uuencode.php"></a>2.2.1. PHP uuencode</h3></div></div></div>

<p>编码：convert_uuencode()</p>

<?php

$some_string = "test\ntext text\r\n";

echo convert_uuencode($some_string);

</pre>

<p>解码：convert_uuencode()</p>

<?php

$some_string = "This is an encoded string";

$encode = convert_uuencode($some_string);

echo convert_uudecode($encode);

</pre>

</div>

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