.zip file viewer for vbulletin question and help

[scriptz]

here is my qusetion im trying to work on a vbmod where a user can view the contents of a .zip file my question is this what is the query to get the info from only the zip extension mimetype what would the string line code be and also what would the attachmentid code look like ?

here is some of my work:

header('Content-Type: text/html; charset=windows-1256'); 
$dir = $DOCUMENT_ROOT.dirname($PHP_SELF); 
$file = ' WHAT DO I PUT HERE '; 
$zip = zip_open($dir.'/'.$file); 

also what would i put here:

 $file = ' WHAT DO I PUT HERE '; 

[Webnet]

it seems common sense to me that you'd put the file name/path