使用 PHP 将 Base64 字符串作为二进制文件保存到磁盘
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原文地址: http://stackoverflow.com/questions/380922/
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Saving a Base64 string to disk as a binary using PHP
提问by Paul Dixon
As a "look under the covers" tutorial for myself I am building a PHP script to gather emails from a POP3 mailbox. While attempting to make use of binary attachments I am stuck trying to figure out what to do with the attachment information.
作为我自己的“深入了解”教程，我正在构建一个 PHP 脚本来从 POP3 邮箱收集电子邮件。在尝试使用二进制附件时，我一直试图弄清楚如何处理附件信息。
Given a string that would be gathered from an email:
给定一个将从电子邮件中收集的字符串：
------=_Part_16735_17392833.1229653992102 Content-Type: image/jpeg; name=trans2.jpg Content-Transfer-Encoding: base64 X-Attachment-Id: f_fow87t5j0 Content-Disposition: attachment; filename=trans2.jpg
/9j/4AAQSkZJRgABAgEASABIAAD/4QxrRXhpZgAATU0AKgAAAAgABwESAAMAAAABAAEAAAEaAAUA AAABAAAAYgEbAAUAAAABAAAAagEoAAMAAAABAAIAAAExAAIAAAAUAAAAcgEyAAIAAAAUAAAAhodp
(...)
EAgEAgEAgEAgEAg8IBQRL/Lbe/tJrScHqZ2lkmE4XUP2XcSDZZ2VvZ28dtbsDIYmhkbRxAIJCAQC AQCAQf/ScyAQCAQCAQCAQCAQCAQCAQCAQCAQCAQf/9k= ------=_Part_16735_17392833.1229653992102--
------=_Part_16735_17392833.1229653992102 内容类型：图像/jpeg；name=trans2.jpg 内容传输编码：base64 X-Attachment-Id：f_fow87t5j0 内容处理：附件；文件名=trans2.jpg
/9j/4AAQSkZJRgABAgEASABIAAD/4QxrRXhpZgAATU0AKgAAAAgABwESAAMAAAABAAEAAAEaAAAUA AAABAAAAYgEbAAUAAAABAAAAagEoAAMAAAABAAIAAAExAAIAAAAUAAAAcgEyAAAIAAAAUAAAAhodp
（……）
EAgEAgEAgEAgEAg8IBQRL/Lbe/tJrScHqZ2lkmE4XUP2XcSDZZ2VvZ28dtbsDIYmhkbRxAIJCAQC AQCAQf/ScyAQCAQCAQCAQCAQCAQCAQCAQCAQCAQf/9k= 6 -------= 3 2 5 3 2 3 2 3 5 3 2 8 3 5 3 0
Is there a way to save off the data to disk so that it would be in a usable format?
有没有办法将数据保存到磁盘，使其成为可用的格式？
回答by Paul Dixon
Pass the data to base64_decode()to get the binary data, write it out to a file with file_put_contents()
将数据传递给base64_decode()以获取二进制数据，使用file_put_contents()将其写入文件
回答by Mike Boers
If you have a lot of data to write out that needs to be decoded before writing I would suggest using stream filters so decode the data as you write it...
如果您有大量数据需要在写入之前进行解码，我建议您使用流过滤器，以便在写入数据时对其进行解码...
$fh = fopen('where_you_are_writing', 'wb');
stream_filter_append($fh, 'convert.base64-decode');
// Do a lot of writing here. It will be automatically decoded from base64.
fclose($h);
回答by Mehdi Karamosly
I tried the below but did not work for me, was generating an empty image file.
我尝试了以下但对我不起作用，正在生成一个空的图像文件。
file_put_contents('img.png', base64_decode($base64string));
this is how it worked for me:
这就是它对我的工作方式：
$data = 'data:image/png;base64,AAAFBfj42Pj4';
list($type, $data) = explode(';', $data);
list(, $data) = explode(',', $data);
$data = base64_decode($data);
file_put_contents('/tmp/image.png', $data);
I took the code from : How to save a PNG image server-side, from a base64 data string
我从以下代码中获取了代码： How to save a PNG image server-side, from a base64 data string
回答by user2511210
function base64_decode_file($data)
{
if(preg_match('/^data\:([a-zA-Z]+\/[a-zA-Z]+);base64\,([a-zA-Z0-9\+\/]+\=*)$/', $data, $matches)) {
return [
'mime' => $matches[1],
'data' => base64_decode($matches[2]),
];
}
return false;
}
回答by Suman
I had a similar situation, and this is what I did. As noted earlier, make sure to remove the extraneous lines before and after the base64 string.
我遇到了类似的情况，这就是我所做的。如前所述，请确保删除 base64 字符串前后的无关行。
<?php
$INPUT = "inputfile_base64_encoded.txt";
$OUTPUT = "output_decoded.zip";
$contents = file_get_contents($INPUT);
$bin = base64_decode($contents);
file_put_contents($OUTPUT, $bin);
?>
回答by smartcoder
Chop off first and last line, base64decodeand save under given filename.
砍掉第一行和最后一行，base64decode并保存在给定的文件名下。
done.
完毕。
回答by Milen A. Radev
While reinventing the wheel has some entertainment and educational value, I would try to resist the temptation: Mailparse, Mail_mimeDecode
虽然重新发明轮子有一些娱乐和教育价值，但我会尽量抵制诱惑：Mailparse，Mail_mimeDecode
回答by esdebon
For big base64 strings from a DB you need use load()
对于来自数据库的大 base64 字符串，您需要使用 load()
$imgdata = $FromDB['BASE64']->load();
$imgdata = base64_decode($imgdata);
file_put_contents($fileName, $imgdata);
