WEB技术分享

实现原理：我们仅仅只需要修改页面HTTP头，把Content-Type设置为force-download，问题即可解决。请看代码：

forceDownload("pdfdemo.pdf");
function forceDownload($filename) {

	if (false == file_exists($filename)) {
		return false;
	}
	
	// http headers
	header('Content-Type: application-x/force-download');
	header('Content-Disposition: attachment; filename="' . basename($filename) .'"');
	header('Content-length: ' . filesize($filename));

	// for IE6
	if (false === strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 6')) {
		header('Cache-Control: no-cache, must-revalidate');
	}
	header('Pragma: no-cache');
		
	// read file content and output
	return readfile($filename);;
}

为了方便，我写了一个函数forceDownload()，然后通过调用该函数即可。请点击这里看演示DEMO。