PHP Script to zip folder. It can be used on shared webhosts where the zip functionality is not enabled. From http://stackoverflow.com/questions/4914750/how-to-zip-a-whole-folder-using-php

zip.php

<?php

$path="../ctest";
$zip = new ZipArchive;
$zip->open('../ctest.zip', ZipArchive::CREATE);
if (false !== ($dir = opendir($path))) {
  while (false !== ($file = readdir($dir))) {
   if ($file != '.' && $file != '..') {
     $zip->addFile($path.DIRECTORY_SEPARATOR.$file);
     //delete if need
     //if($file!=='important.txt') 
       //unlink($path.DIRECTORY_SEPARATOR.$file);
   }
  }
}
else {
  die('Can\'t read dir');
}
$zip->close();