online unzip

<?php 

 // 
// This script lists all of the .zip files in a directory 
// and allows you to select one to unzip.  Unlike CPanel's file 
 // manager, it _will_ overwrite existing files. 
// 
// To use this script, FTP or paste this script into a file in the directory 
// with the .zip you want to unzip.  Then point your web browser at this 
// script and choose which file to unzip. 
  // See if there's a file parameter in the URL string 
   $file = $_GET['file']; 
 
   if (isset($file)) 
  { 
    echo "Unzipping " . $file . "<br>"; 
      system('unzip -o ' . $file); 
       exit; 
     } 

   // create a handler to read the directory contents 
  $handler = opendir("."); 

 echo "Please choose a file to unzip: " . "<br>"; 

// A blank action field posts the form to itself 
 echo '<FORM action="" method="get">'; 

    $found = FALSE; // Used to see if there were any valid files 
 
   // keep going until all files in directory have been read 
     while ($file = readdir($handler)) 
     { 
         if (preg_match ("/.zip$/i", $file)) 
      { 
         echo '<input type="radio" name="file" value=' . $file . '> ' . $file . '<br>'; 
          $found = true; 
        } 
   } 
 
  closedir($handler); 
  
   if ($found == FALSE) 
    echo "No files ending in .zip found<br>"; 
 else 
echo '<br>Warning: Existing files will be overwritten.<br><br><INPUT type="submit" value="Unzip!">'; 
echo "</FORM>"; 
?>