bash zip download

gistfile1.php

if ( $_POST['action'] == 'save' ) {
	if ( isset( $_POST['save_pdf'] ) ) {
		foreach ( $_POST['save_pdf'] as $save_idart ) {
			generate_pdf_file ( $save_idart, $save_to_disc=true );
		}
		//***
		set_time_limit(1800); // run max for 30min
		$debug = true;
		if ( $_POST['action'] == 'save' ) {

		$document_root = $_SERVER['DOCUMENT_ROOT'];
		$dirname = $document_root.'/upload/presse_pdf/';
		if ( $debug == true ) { print($dirname.'<br>'); }

		for ($i=0;$i < count($_POST['save_pdf']);$i++) {
			$_POST['save_pdf'][$i] = 'presse_'.basename($_POST['save_pdf'][$i]).'.pdf';
		}
		if ( $debug == true ) {
			print('<pre>');
			print_r($_POST['save_pdf']);
			print('</pre>');
		}

		$implodeFiles = implode(" ", $_POST['save_pdf']);
		if ( $debug == true ) { print($implodeFiles.'<br>'); }
		$tarName = 'save_pdf-'.date('d-m-Y_H-i').'.zip';

		// script in directory 'upload/php' therefor we need to 'cd ..' first /////cd .. &&
		$shellBefehl = "cd upload/presse_pdf/ && zip -r $tarName $implodeFiles";
		if ( $debug == true ) { print($shellBefehl.'<br>'); }
		exec($shellBefehl,$var);

		if ( $debug == true ) {
			print('<pre>');
			print_r($var);
			print('</pre>');
		}
		// Header für Download senden
		//header("HTTP/1.1 200 OK");
		//header("Content-Type: application/force-download");
		//header('Content-Disposition: attachment; filename="Zip-File-Name.zip"');
		//header("Content-Transfer-Encoding: binary");

		// Zip File senden
		//echo $zip->file();
		//readfile($dir.$file);
		
		//print($document_root);
		$file = $dirname.$tarName;
		print($file);

		if (file_exists($file))
		{
			$zipfile = $file;
			
			// http headers for zip downloads
			header("Pragma: public");
			header("Expires: 0");
			header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
			header("Cache-Control: public");
			header("Content-Description: File Transfer");
			header("Content-type: application/octet-stream");
			header("Content-Disposition: attachment; filename=\"".$tarName."\"");
			header("Content-Transfer-Encoding: binary");
			header("Content-Length: ".filesize($zipfile));
			//ob_end_flush();
			while (ob_get_level()) {
				 ob_end_clean();
			}
			@readfile($zipfile);
			
			
			//header('Content-type: application/zip');
			//header('Content-Disposition: attachment; filename="' . basename($file) . '"');
			//readfile($zipfile);
			unlink($zipfile);
			exit;
		}

		echo "<h1>Content error</h1><p>The file does not exist!</p>";

		} else {
			echo "<h1>Content error</h1><p>Please choose at least one File!</p>";
		}
		//***
	}
}