PHP：如何将图像从 URL 转换为 Base64？
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PHP: How to convert an image from URL to Base64?
提问by Sharj
I want to convert image from its url to base64.
我想将图像从其 url 转换为 base64。
回答by jwueller
Do you want to create a data url? You need a MIME-Type and some other additional information then (see Wikipedia). If this is not the case, this would be a simple base64 representation of the image:
您要创建数据网址吗？您需要一个 MIME-Type 和一些其他附加信息（请参阅Wikipedia）。如果不是这种情况，这将是图像的简单 base64 表示：
$b64image = base64_encode(file_get_contents('path/to/image.png'));
Relevant docs: base64_encode()-function, file_get_contents()-function.
回答by mcelicalderon
I got to this question searching for a similar solution, actually, I understood that this was the original question.
我找到了这个问题，寻找类似的解决方案，实际上，我明白这是最初的问题。
I wanted to do the same, but the file was in a remote server, so this is what I did:
我想做同样的事情，但文件在远程服务器中，所以我这样做了：
$url = 'http://yoursite.com/image.jpg';
$image = file_get_contents($url);
if ($image !== false){
return 'data:image/jpg;base64,'.base64_encode($image);
}
So, this code is from a function that returns a string, and you can output the return value inside the src parameter of an img tag in html. I'm using smarty as my templating library. It could go like this:
所以，这段代码来自一个返回字符串的函数，你可以在html中的一个img标签的src参数中输出返回值。我使用 smarty 作为我的模板库。它可以是这样的：
<img src="<string_returned_by_function>">
Note the explicit call to:
注意显式调用：
if ($image !== false)
This is necessary because file_get_contents can return 0 and be casted to false in some cases, even if the file fetch was successful. Actually in this case it shouldn't happen, but its a good practice when fetching file content.
这是必要的，因为 file_get_contents 可以返回 0 并在某些情况下被强制转换为 false，即使文件获取成功。实际上在这种情况下它不应该发生，但是在获取文件内容时这是一个很好的做法。
回答by Gaurang P
Try this:-
尝试这个：-
Example One:-
示例一：-
<?php
function base64_encode_image ($filename=string,$filetype=string) {
if ($filename) {
$imgbinary = fread(fopen($filename, "r"), filesize($filename));
return 'data:image/' . $filetype . ';base64,' . base64_encode($imgbinary);
}
}
?>
used as so
<style type="text/css">
.logo {
background: url("<?php echo base64_encode_image ('img/logo.png','png'); ?>") no-repeat right 5px;
}
</style>
or
<img src="<?php echo base64_encode_image ('img/logo.png','png'); ?>"/>
Example Two:-
例子二：-
$path= 'myfolder/myimage.png';
$type = pathinfo($path, PATHINFO_EXTENSION);
$data = file_get_contents($path);
$base64 = 'data:image/' . $type . ';base64,' . base64_encode($data);
回答by Lobo
I'm not sure, but check this example http://www.php.net/manual/es/function.base64-encode.php#99842
我不确定，但请查看此示例http://www.php.net/manual/es/function.base64-encode.php#99842
Regards!
问候！
