#1
facebook uses ajax upload, it saves the uploaded image into a temporary directory before transfered to their cdn server, all you need to do is just create to directories one is for temporary and one is for final destination.
#2
if this is related to the facebook style upload a.k.a ajax upload, i would suggest you use uploadify,m this can be done via javascript... though not all browser/system supports it.
#3
refer to #2 answer
#4
parse the string via preg_match_all and do it on the backend...
there you go,,,,




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