如何检查在PHP中上传的文件类型 [英] How to check uploaded file type in PHP
问题描述
我使用这段代码来检查图像的类型,
$ f_type = $ _ FILES ['fupload'] [ '类型'];
或$ f_type ==image / jpegOR $ f_type ==image / JPEG $ f_type ==image / PNGOR $ f_type ==image / GIF)
{
$ error = False;
}
else
{
$ error = True;
$ / code>
但是有些用户抱怨上传任何类型的图片时会出错一些其他人不会得到任何错误!
我想知道这是否解决了这个问题:
if(mime_content_type($ _FILES ['fupload'] ['type'])==image / gif){...
有什么意见?
切勿使用 $ _ FILES .. ['type']
。其中包含的信息根本没有验证,这是一个用户定义的值。自己测试类型。对于图片, exif_imagetype
通常是一个不错的选择:
$ b $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $'$'$'$'
$ detectedType = exif_imagetype($ _ FILES ['fupload'] ['tmp_name']);
$ error =!in_array($ detectedType,$ allowedTypes);
或者, finfo
functions 非常好,如果你的服务器支持的话。
I used this code to check for the type of images,
$f_type=$_FILES['fupload']['type'];
if ($f_type== "image/gif" OR $f_type== "image/png" OR $f_type== "image/jpeg" OR $f_type== "image/JPEG" OR $f_type== "image/PNG" OR $f_type== "image/GIF")
{
$error=False;
}
else
{
$error=True;
}
but some users complain they get an error while uploading any type of images, while some others don't get any errors!
I was wondering if this fixes the problem:
if (mime_content_type($_FILES['fupload']['type']) == "image/gif"){...
Any comments?
Never use $_FILES..['type']
. The information contained in it is not verified at all, it's a user-defined value. Test the type yourself. For images, exif_imagetype
is usually a good choice:
$allowedTypes = array(IMAGETYPE_PNG, IMAGETYPE_JPEG, IMAGETYPE_GIF);
$detectedType = exif_imagetype($_FILES['fupload']['tmp_name']);
$error = !in_array($detectedType, $allowedTypes);
Alternatively, the finfo
functions are great, if your server supports them.
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