Download Files in Folder as ZIP #SS3 #SilverStripe

gistfile1.php

	/**
	* @return SS_HTTPRequest
	*/
	public function assetbackup() {
		$name = $this->Title . '.zip';
		$tmpName = TEMP_FOLDER . '/' . $name;
		$zip = new ZipArchive();
		if(!$zip->open($tmpName, ZipArchive::OVERWRITE)) {
			user_error('Client Export Extension: Unable to read/write temporary zip archive', E_USER_ERROR);
			return;
		}


		$files = new IteratorIterator(
		new RecursiveDirectoryIterator(
		$_SERVER['DOCUMENT_ROOT'] . '/assets/' . $this->Event()->ID,
		RecursiveDirectoryIterator::SKIP_DOTS
		)
		);
		
		foreach($files as $file) {
				$local = str_replace(ASSETS_PATH . '/', '', $file);
				if ( $file->getfileName() != "_resampled") {
					$zip->addFile($file, $local);
				}
		}
		if(!$zip->status == ZipArchive::ER_OK) {
			user_error('Client Export Extension: ZipArchive returned an error other than OK', E_USER_ERROR);
			return;
		}
		$zip->close();
		ob_flush(); // fix browser crash(?)
		$content = file_get_contents($tmpName);
		unlink($tmpName);
		return SS_HTTPRequest::send_file($content, $name);
	}