在这个过程中会有一些浏览器兼容，更准确来说是文件类型解析标识不一致的问题。
网上有很多php文件上传的类，文件上传处理是php的一个特色(至少手册上是将此作为php特点来展示的,个人认为php在数组方面的优异功能更有特色)，学php的人都知道文件上传怎么做，但很多人在编程中却可能忽视了一些细节问题，那就是文件的类型(MIME)。在表单将文件提交给php做处理之前，浏览器会先解析识别一边是什么类型的文件，之后进入php处理环节，php又会去识别解析此文件的原始类型(并不是说你改成什么后缀就是什么文件)。在这个过程中会有一些浏览器兼容，更准确来说是文件类型解析标识不一致的问题。这样在php处理Post过来的文件类型时就需要根据不同浏览器做更多的判断，最典型的就是IE和火狐下的区别。
php上传图片文件(gif,jpg,bmp,png,psd,ico)
史上最完全oophper亲测版php文件上传之文件类型对应表，ie，火狐各一份。
| ie |
火狐 |
| id | 后缀名 | php识别出的文件类型 |
|---|
| 0 |
gif |
image/gif |
| 1 |
jpg |
image/jpeg |
| 2 |
png |
image/png |
| 3 |
bmp |
image/bmp |
| 4 |
psd |
application/octet-stream |
| 5 |
ico |
image/x-icon |
| 6 |
rar |
application/octet-stream |
| 7 |
zip |
application/zip |
| 8 |
7z |
application/octet-stream |
| 9 |
exe |
application/octet-stream |
| 10 |
avi |
video/avi |
| 11 |
rmvb |
application/vnd.rn-realmedia-vbr |
| 12 |
3gp |
application/octet-stream |
| 13 |
flv |
application/octet-stream |
| 14 |
mp3 |
audio/mpeg |
| 15 |
wav |
audio/wav |
| 16 |
krc |
application/octet-stream |
| 17 |
lrc |
application/octet-stream |
| 18 |
txt |
text/plain |
| 19 |
doc |
application/msword |
| 20 |
xls |
application/vnd.ms-excel |
| 21 |
ppt |
application/vnd.ms-powerpoint |
| 22 |
pdf |
application/pdf |
| 23 |
chm |
application/octet-stream |
| 24 |
mdb |
application/msaccess |
| 25 |
sql |
application/octet-stream |
| 26 |
con |
application/octet-stream |
| 27 |
log |
text/plain |
| 28 |
dat |
application/octet-stream |
| 29 |
ini |
application/octet-stream |
| 30 |
php |
application/octet-stream |
| 31 |
html |
text/html |
| 32 |
htm |
text/html |
| 33 |
ttf |
application/octet-stream |
| 34 |
fon |
application/octet-stream |
| 35 |
js |
application/x-javascript |
| 36 |
xml |
text/xml |
| 37 |
dll |
application/octet-stream |
| 38 |
dll |
application/octet-stream |
|
| id | 后缀名 | php识别出的文件类型 |
|---|
| 0 |
gif |
image/gif |
| 1 |
jpg |
image/pjpeg |
| 2 |
png |
image/x-png |
| 3 |
bmp |
image/bmp |
| 4 |
psd |
application/octet-stream |
| 5 |
ico |
image/x-icon |
| 6 |
rar |
application/octet-stream |
| 7 |
zip |
application/x-zip-compressed |
| 8 |
7z |
application/octet-stream |
| 9 |
exe |
application/octet-stream |
| 10 |
avi |
video/avi |
| 11 |
rmvb |
application/vnd.rn-realmedia-vbr |
| 12 |
3gp |
application/octet-stream |
| 13 |
flv |
application/octet-stream |
| 14 |
mp3 |
audio/mpeg |
| 15 |
wav |
audio/wav |
| 16 |
krc |
application/octet-stream |
| 17 |
lrc |
application/octet-stream |
| 18 |
txt |
text/plain |
| 19 |
doc |
application/msword |
| 20 |
xls |
application/vnd.ms-excel |
| 21 |
ppt |
application/vnd.ms-powerpoint |
| 22 |
pdf |
application/pdf |
| 23 |
chm |
application/octet-stream |
| 24 |
mdb |
application/msaccess |
| 25 |
sql |
text/plain |
| 26 |
con |
application/octet-stream |
| 27 |
log |
text/plain |
| 28 |
dat |
text/plain |
| 29 |
ini |
application/octet-stream |
| 30 |
php |
application/octet-stream |
| 31 |
html |
text/html |
| 32 |
htm |
text/html |
| 33 |
ttf |
application/octet-stream |
| 34 |
fon |
application/octet-stream |
| 35 |
js |
text/html |
| 36 |
xml |
text/xml |
| 37 |
dll |
application/octet-stream |
| 38 |
class |
application/java |
|
来自：http://www.jb51.net/article/23511.htm
