I'm trying to create a fallback method when ZipArchive is not present. I'm seeking to use the _unzip_file_pclzip() function contained in wp-admin/includes/file.php

However, I'm not sure what is expected for the $needed_dirs argument.

My target folder for the zip will be the "styles" folder under my theme folder, so the path would be "wp-content/themes/mytheme/styles/"

Is that what's expected for $needed_dirs?

function openZip($file_to_open) { 
    global $wp_filesystem;//required if _unzip_file_pclzip is used directly
    global $target;  
        $zip = new ZipArchive();  
        $x = $zip->open($file_to_open);  
        if($x === true) 
        } else {  
            die("There was a problem. Please try again!");  
        $needed_dirs = array();
        _unzip_file_pclzip($file_to_open, $target, $needed_dirs);

@Scott B I have not tested this script, taken from inlcudes/file.php -> line 559

_unzip_file_pclzip assumes WP_Filesystem() has already been called, so you need to set up global $wp_filesystem

global $wp_filesystem;
$needed_dirs = array();
$target = trailingslashit($target);

// Determine any parent dir's needed (of the upgrade directory)
if ( ! $wp_filesystem->is_dir($target) ) { //Only do parents if no children exist
    $path = preg_split('![/\\\]!', untrailingslashit($target));
    for ( $i = count($path); $i >= 0; $i-- ) {
        if ( empty($path[$i]) )

        $dir = implode('/', array_slice($path, 0, $i+1) );
        if ( preg_match('!^[a-z]:$!i', $dir) ) // Skip it if it looks like a Windows Drive letter.

        if ( ! $wp_filesystem->is_dir($dir) )
            $needed_dirs[] = $dir;
             break; // A folder exists, therefor, we dont need the check the levels below this
| improve this answer | |
  • I've added the global to my question code. I'm still not sure what to pass for $needed_dirs. Are you saying i can just pass an empty array? – Scott B Feb 1 '11 at 16:42
  • I'm getting error > Call to a member function mkdir() on a non-object in C:\xampplite\htdocs\mysite\wp-admin\includes\file.php on line 703...Any ideas? – Scott B Feb 1 '11 at 16:47
  • Best I can tell, the problem lies with the $wp_filesystem variable not getting indexed. When I var_dump($wp_filesystem), its returning NULL. So that's invalidating the call to $wp_filesystem->mkdir() – Scott B Feb 1 '11 at 18:56

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