zip.php

<?
	/**
	 * This script will create a zip file of the current quizzes folder.
	 */

	/**
	 * Create a zip file
	 *
	 * @param array $files An array of strings containing names of files to be compressed. Defaults to current directory files
	 * @param string $destination The absolute path to the  destination folder
	 * @param boolean $overwrite Set to true to overwrite the previous zip
	 *
	 * @return boolean Returns true if successful and false if not successful or the zip file exists and $overwrite is false
	 */
	function create_zip($files = array(), $destination = '', $overwrite = false) {
		//if the zip file already exists and overwrite is false, return false
		if (file_exists($destination) && !$overwrite) {
			return false;
		}
		//vars
		$valid_files = array();
		//if files were passed in...
		if (is_array($files)) {
			//cycle through each file
			foreach ($files as $file) {
				//make sure the file exists
				if (file_exists($file)) {
					$valid_files[] = $file;
				}
			}
		}
		//if we have good files...
		if (count($valid_files)) {
			//create the archive
			$zip = new ZipArchive();
			if ($zip->open($destination, $overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
				return false;
			}
			//add the files
			foreach ($valid_files as $file) {
				$zip->addFile($file, $file);
			}
			//close the zip -- done!
			$zip->close();

			//check to make sure the file exists
			return file_exists($destination);
		} else {
			return false;
		}
	}

	//check to see if we can create the file
	if (create_zip(glob('quizzes/*.json'), 'quizzes.zip', true)) {
		header('Cache-Control: public');
		header('Content-Descriptor: File Transfer');
		header('Content-Disposition: attachmentfilename="quizzes.zip"');
		header('Content-Type: application/zip');
		header('Content-Transfer-Encoding: binary');

		ob_clean(); //clean the output buffer
		flush(); //flush it too just to be sure
		readfile('quizzes/quizzes.zip');
		exit();
	}

	//if not, tell us
	header('Content-Type: application/text');
	exit('Failed to deliver file. File not found?');