php 如何从base64编码的jpeg创建GD图像？
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How to create GD Image from base64 encoded jpeg?
提问by The Surrican
I have an upload Api that as a response object delivers (along with other stuff inside a Json object) a base64 encoded jpeg image.
我有一个上传 Api，它作为响应对象提供（以及 Json 对象中的其他内容）一个 base64 编码的 jpeg 图像。
I create the encoded image as so:
我这样创建编码图像：
$im; // gd image resource
ob_start();
imagejpeg($im);
$data = base64_encode(ob_get_clean());
The data then is put inside a form field using javascript and submitted.
然后使用 javascript 将数据放入表单字段中并提交。
How can I create a GD resource from that again so that I actually can save that image as a file?
如何再次从该资源创建 GD 资源，以便我可以将该图像保存为文件？
Everything in PHP.
PHP中的一切。
回答by
You can use imagecreatefromstring()function:
您可以使用imagecreatefromstring()函数：
$data = base64_decode($_POST['image_as_base64']);
$formImage = imagecreatefromstring($data);
"String" does not mean a "real" string. In that case it means bytes/blob data.
“字符串”并不意味着“真正的”字符串。在这种情况下，它意味着字节/blob 数据。
回答by Vilx-
How can I create a GD resource from that again so that I actually can save that image as a file?
如何再次从该资源创建 GD 资源，以便我可以将该图像保存为文件？
Are you sure you need to do that extra step? How about:
你确定你需要做那个额外的步骤吗？怎么样：
file_put_contents('MyFile.jpg', base64_decode($_POST['MyFormField']));
回答by Sarvar Nishonboev
I did by this way:
我是这样做的：
// input is in format: data:image/png;base64,...
$str="data:image/png;base64,";
$data=str_replace($str,"",$_POST['image']);
$data = base64_decode($data);
file_put_contents('tmp/'.mktime().'.png', $data);
