文件上传后验证是否为图像 [英] Validate whether image, after file upload

问题描述

[PHP] if（！（$ _ FILES [''image''] [''type''] ==" image / gif" || $ _FILES [''image''] [''type' '] ==" image / jpg" || $ _FILES [''image''] [''type''] ==" image / jpeg" || $ _FILES [''image''] [''类型''] ==" image / png"））

die（''无效的文件类型''）; [/ PHP]

这会显示错误上传除图像文件以外的文件。

但是如果有人手动更改mime类型，例如从 .xcf 到 .png ，那么这不会没帮忙。


如何限制？

解决方案

_FILES [''image''] [' 'type''] ==" image / gif" ||

_FILES [''image''] [''type''] ==" image / jpg" ||

_FILES [''image''] [''type''] ==" image / jpeg" ||

[PHP]if (!($_FILES[''image''][''type''] == "image/gif" || $_FILES[''image''][''type''] == "image/jpg" || $_FILES[''image''][''type''] == "image/jpeg" || $_FILES[''image''][''type''] == "image/png"))
die (''Invalid File Type'');[/PHP]
This displays error when a file other than image file is uploaded.
But if someone manually changes the mime type, say from .xcf to .png, then this doesn''t help.

How can I restrict that?

解决方案

_FILES[''image''][''type''] == "image/gif" ||

_FILES[''image''][''type''] == "image/jpg" ||

_FILES[''image''][''type''] == "image/jpeg" ||

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