Programming Tutorials

Extract files from a .zip file using PHP

By: David Sklar in PHP Tutorials on 2008-12-01  

The unzip.php sample program below, extracts files from a ZIP archive. It uses the pc_mkdir_parents() function. The program also requires PHP's zip extension to be installed. You can find documentation on the zip extension at http://www.php.net/zip.

This program takes a few arguments on the command line. The first is the name of the ZIP archive it should unzip. By default, it unzips all files in the archive. If additional command-line arguments are supplied, it only unzips files whose name matches any of those arguments. The full path of the file inside the ZIP archive must be given. If turtles.html is in the ZIP archive inside the animals directory, unzip.php must be passed animals/turtles.html, not just turtles.html, to unzip the file.

Directories are stored as 0-byte files inside ZIP archives, so unzip.php doesn't try to create them. Instead, before it creates any other file, it uses pc_mkdir_parents() to create all directories that are parents of that file, if necessary. For example, say unzip.php sees these entries in the ZIP archive:

animals (0 bytes)
animals/frogs/ribbit.html (2123 bytes)
animals/turtles.html   (1232 bytes)

It ignores animals because it is 0 bytes long. Then it calls pc_mkdir_parents() on animals/frogs, creating both animals and animals/frogs, and writes ribbit.html into animals/frogs. Since animals already exists when it reaches animals/turtles.html, it writes out turtles.html without creating any additional directories.

unzip.php (sample code)
// the first argument is the zip file
$in_file = $_SERVER['argv'][1];

// any other arguments are specific files in the archive to unzip
if ($_SERVER['argc'] > 2) {
    $all_files = 0;
    for ($i = 2; $i < $_SERVER['argc']; $i++) {
        $out_files[$_SERVER['argv'][$i]] = true;
    }
} else {
    // if no other files are specified, unzip all files
    $all_files = true;
}

$z = zip_open($in_file) or die("can't open $in_file: $php_errormsg");
while ($entry = zip_read($z)) {
    
    $entry_name = zip_entry_name($entry);

    // check if all files should be unzipped, or the name of
    // this file is on the list of specific files to unzip
    if ($all_files || $out_files[$entry_name]) {

        // only proceed if the file is not 0 bytes long
        if (zip_entry_filesize($entry)) {
            $dir = dirname($entry_name);

            // make all necessary directories in the file's path
            if (! is_dir($dir)) { pc_mkdir_parents($dir); }

            $file = basename($entry_name);

            if (zip_entry_open($z,$entry)) {
                if ($fh = fopen($dir.'/'.$file,'w')) {
                    // write the entire file
                    fwrite($fh,
                           zip_entry_read($entry,zip_entry_filesize($entry)))
                        or error_log("can't write: $php_errormsg");
                    fclose($fh) or error_log("can't close: $php_errormsg");
                } else {
                    error_log("can't open $dir/$file: $php_errormsg");
                }
                zip_entry_close($entry);
            } else {
                error_log("can't open entry $entry_name: $php_errormsg");
            }
        }
    }
}





Add Comment

* Required information
1000

Comments

No comments yet. Be the first!

Most Viewed Articles (in PHP )

Different versions of PHP - History and evolution of PHP

PHP Warning: Unknown(): Unable to load dynamic library '/usr/local/php4/lib/php/extensions/no-debug ......

Input Validation in PHP

Counting Lines, Paragraphs, or Records in a File using pc_split_paragraphs() in PHP

Convert a hex string into a 32-bit IEEE 754 float number in PHP

A Basic Example using PHP in AWS (Amazon Web Services)

Opening a Remote File in PHP

Exception in module wampmanager.exe at 000F15A0 in Windows 8

Find Difference between two dates in PHP

PHP INSTALLATION on Solaris 9 (Sparc)

XMLRPC for PHP - A simple client and server program

Parent: child process exited with status 3221225477 -- Restarting

Install and use PHPUnit to test your PHP pages for errors.

Using Codeigniter for PHP application development

Using Text-File Databases in PHP

Latest Articles (in PHP)