I have a sever which people can upload files to. The problem is that some of the filenames are mangled (dont have any extension) and so I cannot immediately determine file type. This question is two part: for the files which do have filenames what is the best way to determine whether or not it is an image? (Just a big long if/else if list?) Secondly, for the files which dont have extensions, how can I determine if they are images?
12条回答 默认 最新
- dongyun6835 2011-12-06 19:53关注
You can use
exif_imagetype()
<?php $type =exif_imagetype($image);
where $type is a value
- IMAGETYPE_GIF
- IMAGETYPE_JPEG
- IMAGETYPE_PNG
- IMAGETYPE_SWF
- IMAGETYPE_PSD
- IMAGETYPE_BMP
- IMAGETYPE_TIFF_II (intel byte order)
- IMAGETYPE_TIFF_MM (motorola byte order)
- IMAGETYPE_JPC
- IMAGETYPE_JP2
- IMAGETYPE_JPX
- IMAGETYPE_JB2
- IMAGETYPE_SWC
- IMAGETYPE_IFF
- IMAGETYPE_WBMP
- IMAGETYPE_XBM
- IMAGETYPE_ICO
From the manual:
When a correct signature is found, the appropriate constant value will be returned otherwise the return value is FALSE. The return value is the same value that
getimagesize()
returns in index 2 butexif_imagetype()
is much faster.本回答被题主选为最佳回答 , 对您是否有帮助呢?解决 无用评论 打赏 举报
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