there is no indication what exactly you want to know , its too ambiguous , but 
all i can say this book sounds like a dud, terrible explanation on file 
uploads, check out this pear package, it helped a great deal ,although i had 
to mod it to also do a check for mimetypes , as say i allowed only the 
extension types of jpg , or zip , i could rename an executable file to a jpg 
or zip and maybe it could be executed , anyway i had to mod it to also do a 
mime types allow check but anyway check it out 
http://pear.php.net/package-info.php?pacid=20

also do a print_r($_FILES); this will show u what you may need to know



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