解码 base64 字符串 - php
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Decode base64 string - php
提问by thuk
Is there any way to decode this string??
有没有办法解码这个字符串？
Actual string : 其他語言測試 - testing
实际字符串 : 其他语言测试 - testing
base64 encode while sending on mail as subject as
base64 编码，同时作为主题发送邮件
"=?iso-2022-jp?B?GyRCQjZCPjhsOEBCLDtuGyhCIC0gdGVzdGluZw==?="
"=?iso-2022-jp?B?GyRCQjZCPjhsOEBCLDtuGyhCIC0gdGVzdGluZw==?="
<?php
echo base64_decode('GyRCQjZCPjhsOEBCLDtuGyhCIC0gdGVzdGluZw==');
?>
This is base 64 encode, I couldn't decode it to actual Chinese string.Since it has been encoded using "iso-2022-jp", I have also tried online base64decode.org site to decode this string, but I couldn't find the original string, how can I do that?
这是base 64编码，我无法将其解码为实际的中文字符串。由于它已使用“iso-2022-jp”进行编码，因此我也尝试过在线base64decode.org站点来解码此字符串，但我无法找到原始字符串，我该怎么做？
回答by Jason OOO
回答by duskwuff -inactive-
What you are looking at is MIME header encoding. It can be decoded by mb_decode_mimeheader(), and generated by mb_encode_mimeheader(). For example:
您正在查看的是 MIME 标头编码。它可以由 解码，并由mb_decode_mimeheader()生成mb_encode_mimeheader()。例如：
<?php
mb_internal_encoding("utf-8");
$subj = "=?iso-2022-jp?B?GyRCQjZCPjhsOEBCLDtuGyhCIC0gdGVzdGluZw==?=";
print mb_decode_mimeheader($subj);
?>
其他語言測試 - testing
(The call to mb_internal_encoding()is necessary here because the contents of the subject line can't be represented in the default internal encoding of ISO8859-1.)
（mb_internal_encoding()这里需要调用 to因为主题行的内容不能用 ISO8859-1 的默认内部编码表示。）
回答by Daniel Perez
Try encoding the string to UTF-8 first and then encode it to base 64. Same when decoding, decode the string from base64 and then from UTF-8. This is working for me:
尝试先将字符串编码为 UTF-8，然后将其编码为 base 64。解码时相同，先从 base64 解码字符串，然后再从 UTF-8 解码。这对我有用：
php > $base = "其他語言測試 - testing";
php > $encoded = base64_encode(utf8_encode($base));
php > $decoded = utf8_decode(base64_decode($encoded));
php > echo ($decoded === $base) . "\n";
1
