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Filename : unzipper.php
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<?php
/**
 * The Unzipper extracts .zip or .rar archives and .gz files on webservers.
 * It also supports creating Zip archives.
 *
 * @author  Andreas Tasch, at[tec], attec.at
 * @license GNU GPL v3
 * @version 0.1.0
*/
@set_time_limit(600);

define('VERSION', '0.1.0');
$timestart = microtime(TRUE);
$GLOBALS['status'] = array();
$unzipper = new Unzipper;

//Unzip Archive
if(isset($_POST['dounzip'])){
  //check if an archive was selected for unzipping
  $archive = isset($_POST['zipfile']) ? strip_tags($_POST['zipfile']) :'';
  $destination = isset($_POST['extpath']) ? strip_tags($_POST['extpath']) :'';
  $unzipper->prepareExtraction($archive, $destination);
}

//Create zip archive
if(isset($_POST['dozip'])){
  $zippath = !empty($_POST['zippath']) ? strip_tags($_POST['zippath']) :'.';
  // Resulting zipfile e.g. zipper--2016-07-23--11-55.zip
  $zipfile = 'zipper-'. date('Y-m-d--H-i') .'.zip';
  Zipper::zipDir($zippath, $zipfile);
}

$timeend = microtime(TRUE);
$time = $timeend - $timestart;

/**
 * Class Unzipper
 */
class Unzipper {
  public $localdir ='.';
  public $zipfiles = array();
  public function __construct(){
    //read directory and pick .zip and .gz files
    if($dh = opendir($this->localdir)){
      while (($file = readdir($dh)) !== FALSE){
        if(pathinfo($file, PATHINFO_EXTENSION)==='zip' || pathinfo($file, PATHINFO_EXTENSION)==='gz' || pathinfo($file, PATHINFO_EXTENSION)==='rar') $this->zipfiles[] = $file;
      }
      closedir($dh);
      if(!empty($this->zipfiles)) $GLOBALS['status'] = array('info'=>'.zip or .gz or .rar files found, ready for extraction');
      else $GLOBALS['status'] = array('info'=>'No .zip or .gz or rar files found. So only zipping functionality available.');
    }
  }

  // Prepare and check zipfile for extraction
  public function prepareExtraction($archive, $destination){
    // Determine paths.
    if(empty($destination)) $extpath = $this->localdir;
    else {
      $extpath = $this->localdir .'/'. $destination;
      // todo move this to extraction function
      if(!is_dir($extpath)) mkdir($extpath);
    }
    //allow only local existing archives to extract
    if(in_array($archive, $this->zipfiles)) self::extract($archive, $extpath);
  }

  //Checks file extension and calls suitable extractor functions
  public static function extract($archive, $destination){
    $ext = pathinfo($archive, PATHINFO_EXTENSION);
    switch($ext){
      case 'zip':
        self::extractZipArchive($archive, $destination);
        break;
      case 'gz':
        self::extractGzipFile($archive, $destination);
        break;
      case 'rar':
        self::extractRarArchive($archive, $destination);
        break;
    }
  }

  //Decompress/extract a zip archive using ZipArchive
  public static function extractZipArchive($archive, $destination){
    // Check if webserver supports unzipping.
    if(!class_exists('ZipArchive')){
      $GLOBALS['status'] = array('error'=>'Error: Your PHP version does not support unzip functionality.');
      return;
    }
    $zip = new ZipArchive;
    // Check if archive is readable.
    if($zip->open($archive)===TRUE){
      // Check if destination is writable
      if(is_writeable($destination .'/')){
        $zip->extractTo($destination);
        $zip->close();
        $GLOBALS['status'] = array('success'=>'Files unzipped successfully');
      }
      else  $GLOBALS['status'] = array('error'=>'Error: Directory not writeable by webserver.');
    }
    else $GLOBALS['status'] = array('error'=>'Error: Cannot read .zip archive.');
  }

  // Decompress a .gz File
  public static function extractGzipFile($archive, $destination){
    // Check if zlib is enabled
    if(!function_exists('gzopen')){
      $GLOBALS['status'] = array('error'=>'Error: Your PHP has no zlib support enabled.');
      return;
    }
    $filename = pathinfo($archive, PATHINFO_FILENAME);
    $gzipped = gzopen($archive, 'rb');
    $file = fopen($filename, 'w');
    while($string = gzread($gzipped, 4096)) fwrite($file, $string, strlen($string));
    gzclose($gzipped);
    fclose($file);
    // Check if file was extracted.
    if(file_exists($destination .'/'. $filename)) $GLOBALS['status'] = array('success'=>'File unzipped successfully.');
    else $GLOBALS['status'] = array('error'=>'Error unzipping file.');
  }

  //Decompress/extract a Rar archive using RarArchive
  public static function extractRarArchive($archive, $destination){
    // Check if webserver supports unzipping.
    if(!class_exists('RarArchive')){
      $GLOBALS['status'] = array('error'=>'Error: Your PHP version does not support .rar archive functionality. <a class="info" href="http://php.net/manual/en/rar.installation.php" target="_blank">How to install RarArchive</a>');
      return;
    }
    // Check if archive is readable.
    if($rar = RarArchive::open($archive)){
      // Check if destination is writable
      if(is_writeable($destination .'/')){
        $entries = $rar->getEntries();
        foreach ($entries as $entry){
          $entry->extract($destination);
        }
        $rar->close();
        $GLOBALS['status'] = array('success'=>'Files extracted successfully.');
      }
      else $GLOBALS['status'] = array('error'=>'Error: Directory not writeable by webserver.');
    }
    else  $GLOBALS['status'] = array('error'=>'Error: Cannot read .rar archive.');
  }
}

/**
 * Class Zipper
 *
 * Copied and slightly modified from http://at2.php.net/manual/en/class.ziparchive.php#110719
 * @author umbalaconmeogia
 */
class Zipper {
  /**
   * Add files and sub-directories in a folder to zip file.
   *
   * @param string     $folder
   *   Path to folder that should be zipped.
   *
   * @param ZipArchive $zipFile
   *   Zipfile where files end up.
   *
   * @param int        $exclusiveLength
   *   Number of text to be exclusived from the file path.
   */
  private static function folderToZip($folder, &$zipFile, $exclusiveLength){
    $handle = opendir($folder);
    while(FALSE !== $f = readdir($handle)){
      // Check for local/parent path or zipping file itself and skip.
      if($f !='.' && $f != '..' && $f != basename(__FILE__)){
        $filePath = $folder .'/'. $f;
        // Remove prefix from file path before add to zip.
        $localPath = substr($filePath, $exclusiveLength);
        if(is_file($filePath)) $zipFile->addFile($filePath, $localPath);
        else if(is_dir($filePath)){
          // Add sub-directory.
          $zipFile->addEmptyDir($localPath);
          self::folderToZip($filePath, $zipFile, $exclusiveLength);
        }
      }
    }
    closedir($handle);
  }
  /**
   * Zip a folder (including itself).
   * Usage:
   *   Zipper::zipDir('path/to/sourceDir', 'path/to/out.zip');
   *
   * @param string $sourcePath
   *   Relative path of directory to be zipped.
   *
   * @param string $outZipPath
   *   Relative path of the resulting output zip file.
   */
  public static function zipDir($sourcePath, $outZipPath){
    $pathInfo = pathinfo($sourcePath);
    $parentPath = $pathInfo['dirname'];
    $dirName = $pathInfo['basename'];
    $z = new ZipArchive();
    $z->open($outZipPath, ZipArchive::CREATE);
    $z->addEmptyDir($dirName);
    if($sourcePath == $dirName) self::folderToZip($sourcePath, $z, 0);
    else  self::folderToZip($sourcePath, $z, strlen($parentPath.'/'));

    $z->close();
    $GLOBALS['status'] = array('success'=>'Successfully created archive '. $outZipPath);
  }
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>File Unzipper, Unrar + Zipper</title>
<style>
<!--
body {
font-family: Arial, sans-serif;
line-height: 150%;
}
label {
display: block;
margin-top: 20px;
}
fieldset {
border: 0;
background-color: #EEE;
margin: 10px 0 10px 0;
}
.select {
padding: 5px;
font-size: 110%;
}
.status {
margin: 0;
margin-bottom: 20px;
padding: 10px;
font-size: 80%;
background: #EEE;
border: 1px dotted #DDD;
}
.status--ERROR {
background-color: red;
color: white;
font-size: 120%;
}
.status--SUCCESS {
background-color: green;
font-weight: bold;
color: white;
font-size: 120%
}
.small {
font-size: 0.7rem;
font-weight: normal;
}
.version {
font-size: 80%;
}
.form-field {
border: 1px solid #AAA;
padding: 8px;
width: 280px;
}
.info {
margin-top: 0;
font-size: 80%;
color: #777;
}
.submit {
background-color: #378de5;
border: 0;
color: #ffffff;
font-size: 15px;
padding: 10px 24px;
margin: 20px 0 20px 0;
text-decoration: none;
}
.submit:hover {
background-color: #2c6db2;
cursor: pointer;
}
-->
</style>
</head>
<body>
<p class="status status--<?php echo strtoupper(key($GLOBALS['status'])); ?>">
  Status: <?php echo reset($GLOBALS['status']); ?><br/>
  <span class="small">Processing Time: <?php echo $time; ?> seconds</span>
</p>
<form action="" method="POST">
  <fieldset>
    <h1>Archive Unzipper</h1>
    <label for="zipfile">Select .zip or .rar archive or .gz file you want to extract:</label>
    <select name="zipfile" size="1" class="select">
<?php
foreach($unzipper->zipfiles as $zip) echo "<option>$zip</option>";
?>
    </select>
    <label for="extpath">Extraction path (optional):</label>
    <input type="text" name="extpath" class="form-field" />
    <p class="info">Enter extraction path without leading or trailing slashes (e.g. "mypath"). If left empty current directory will be used.</p>
    <input type="submit" name="dounzip" class="submit" value="Unzip Archive"/>
  </fieldset>
  <fieldset>
    <h1>Archive Zipper</h1>
    <label for="zippath">Path that should be zipped (optional):</label>
    <input type="text" name="zippath" class="form-field" />
    <p class="info">Enter path to be zipped without leading or trailing slashes (e.g. "zippath"). If left empty current directory will be used.</p>
    <input type="submit" name="dozip" class="submit" value="Zip Archive"/>
  </fieldset>
</form>
<p class="version">Unzipper version: <?php echo VERSION; ?></p>
</body>
</html>