too long

Question

I am trying to show the file and directory contents of a zip file without extracting it. Zip library is not installed with PHP and I don't have permission to install it.

I am trying now to parse the output of unzip -l <zipfile> to get the directory structure of the zip file together with other file information. I can easily get the file information by parsing the result line by line. However, I found it difficult to convert it a directory structure in array since I'm just a newbie in php. the structure is something like below (please ignore the syntax I'm just trying to show the structure). Subdirectories or sub files are placed inside the children index.

$file[0]['file_name'] = 'dir1',
$file[0]['children'] = array($subfile[0]['file_name'] = 'subdir1',
                 $subfile[0]['children'] = .....,
                 $subfile[1]['file_name'] = 'subdir1',
                 $subfile[1]['children'] = .....)
$file[1]['file_name'] = 'dir2',
$file[1]['children'] = array($subfile[0]['file_name'] = 'subdir1',
                 $subfile[0]['children'] = .....,
                 $subfile[1]['file_name'] = 'subdir1',
                 $subfile[1]['children'] = .....)

Below is the sample output of unzip -l <zipfile>.

12363  08-18-2010 13:07   lsmaps/aka.gif 
10299  03-10-2010 12:34   lsmaps/aob.gif 
26095  03-10-2010 12:34   lsmaps/cba.gif

Would you know of better way of doing it?

Thanks

Answer 1

pclzip a pure PHP (read: you can just copy the files into your project) reader and writer for zip, like this:

require_once('pclzip.lib.php');
$archive = new PclZip('zipfile.zip');
var_export($archive->listContent());

To convert the flat information into a tree, you can use the following helper function:

function flatToTree($flat) {
    $res = array();
    foreach ($flat as $e) {
        $parent =& $res;
        $path = explode('/', $e['filename']);
        for ($i = 0;$i < count($path) - 1;$i++) {
            if (! array_key_exists($path[$i], $parent)) {
                $parent[$path[$i]] = array('file_name'=>$path[$i],
                                           'children'=>array());
            }
            $parent =& $parent[$path[$i]]['children'];
        }
        $basename = $path[count($path)-1];
        if ($basename != '') { // A file, not a directory
            $parent[$basename] = array('file_name' => $path[$i]);
        }
    }
    return $res;
}
var_export(flatToTree($archive->listContents()));

Note that it uses associative arrays (or dictionary/maps) to allow faster access to the files by name. You can still iterate over it with foreach. If you, however, must have numeric arrays, simply call array_values on each element.