how to recognize CSV file?

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hi,
I have form where administrator has toupload csv file to update dome
data in mysql.
I was trying to validate entered file but got some crazy stuff I don't
understand:

for the same uploaded csv file, in different browser I'll get different
results:

Windows machine and IE: $_FILES['UploadedFile']['type'] = 'text/plain'
Windows machine and Firefox: $_FILES['UploadedFile']['type'] =
'application/octet-stream'
Windows machine and Opera: $_FILES['UploadedFile']['type'] =
'comma-separated-values'
Windows machine and Chrome: $_FILES['UploadedFile']['type'] = ''
(doesn't show anything! empty?!?!!??)
openSuse machine and Firefox: $_FILES['UploadedFile']['type'] = 'text/csv'
openSuse machine and Opera: $_FILES['UploadedFile']['type'] =
'text/comma-separated-values'
openSuse machine and Konqueror: $_FILES['UploadedFile']['type'] = 'text/csv'

ok. what's CORRECT way to validate uploaded file?

thanks.

-afan





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