file.php

someFile.php

function outputFileDownload($files, $articleFiles) {
		$filePrefix = 'Downloads_-_';
		$zipname = "blc_files.zip";
		$zip = new ZipArchive();
		$zip->open($zipname, ZipArchive::CREATE);
		foreach ($files as $fileName => $fileValue) {
			$allowedDownload = false;
			foreach ($articleFiles as $articleFile) { // Security check here because otherwise people could download all files from the whole wiki: only allow file downloads for files attached to downloads page
				if ($filePrefix . $fileName == $articleFile->img_name) {
					$allowedDownload = true;
				}
			}
			if ($allowedDownload) {
				$wfFile = wfFindFile($filePrefix . $fileName);
				$zip->addFile($wfFile->getLocalRefPath(), $fileName);
			}

		}
		$zip->close();

		header('Content-Type: application/zip');
		header('Content-disposition: attachment; filename=' . $zipname);
		header('Content-Length: ' . filesize($zipname));

		readfile($zipname);
		return unlink($zipname);
	}