除了
原文链接：https://www.f2er.com/php/131901.htmlgetimagesize(),您可以使用
exif_imagetype()
exif_imagetype() reads the first bytes of an image and checks its signature.
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 but exif_imagetype() is much faster.
