Content-Type in form variables

If I receive a form via POST or PUT with with mulitple variables, files, application/json, others, is there anywhere in the environment to test he mime type of each variable?

POST /en/html/dummy.php HTTP/1.1
Host: www.explainth.at
User-Agent: Mozilla/5.0 (Windows;en-GB; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11
Accept: text/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://www.explainth.at/en/misc/httpreq.shtml?txt=
Content-Type: multipart/form-data; boundary=---------------------------103832778631715
Content-Length: 355

-----------------------------103832778631715
Content-Disposition: form-data; name="JSON_OBJS"
Content-Type: application/json

{
"variable_name": 8675309
"blob_value": NULL
}
-----------------------------103832778631715
Content-Disposition: form-data; name="blob_value"; filename="previous.png"

Content-Type: image/png

‰PNG


-----------------------------103832778631715

Dennis Gearon

Signature Warning
----------------
EARTH has a Right To Life

I agree with Bolivian President Evo Morales

# The right to life: "The right for no ecosystem to be eliminated by the irresponsible acts of human beings."

# The right of biosystems to regenerate themselves: "Development cannot be infinite. There's a limit on everything."

# The right to a clean life: "The right for Mother Earth to live without contamination, pollution. Fish and animals and trees have rights."

# The right to harmony and balance between everyone and everything: "We are all interdependent."

See the movie - 'Inconvenient Truth'
See the movie - 'Syriana'