从PHP的base64字符串检测图像类型 [英] Detecting image type from base64 string in PHP

问题描述

是否有可能找出EN codeD作为PHP一个base64字符串图像的类型？

Is it possible to find out the type of an image encoded as a base64 String in PHP?

我没有访问原始图像文件，只需连接codeD字符串的方法。从我所看到的， imagecreatefromstring（）可以创建一个字符串再presentation图像资源（后它已经从的base64德codeD），但它会自动检测图像类型和图像资源本身是一个特殊的PHP重新presentation。如果我想再次将图像保存为一个文件，我不知道如果我将其保存为类型对应于从该字符串重新presentation创建的原始类型。

I have no method of accessing the original image file, just the encoded string. From what I've seen, imagecreatefromstring() can create an image resource from a string representation (after it's been decoded from base64), but it automatically detects the image type and the image resource itself is a special PHP representation. In case I want to save the image as a file again, I would have no idea if the type I am saving it as corresponds to the original type from which the String representation was created.

推荐答案

的FileInfo 可以做为你：

$encoded_string = "....";
$imgdata = base64_decode($encoded_string);

$f = finfo_open();

$mime_type = finfo_buffer($f, $imgdata, FILEINFO_MIME_TYPE);

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