<?php 
	header('HTTP/1.1 200 OK');						// ok 正常访问
	header('HTTP/1.1 404 Not Found');				//通知浏览器 页面不存在
	header('HTTP/1.1 301 Moved Permanently');		//设置地址被永久的重定向 301
	header('Location: http://www.php520.cn/');		//跳转到一个新的地址
	header('Refresh:10;url=http://www.php520.cn/');	//延迟转向 也就是隔几秒跳转
	header('X-Powered-By: PHP/6.0.0'); 				//修改 X-Powered-By信息
	header('Content-language: en'); 				//文档语言
	header('Content-Length: 1234'); 				//设置内容长度
	header('Last-Modified:'.gmdate('D, d M Y H:i:s', $time).' GMT'); //告诉浏览器最后一次修改时间
	header('HTTP/1.1 304 Not Modified'); 			//告诉浏览器文档内容没有发生改变

	/* 内容类型 */
	header('Content-Type: text/html; charset=utf-8');//网页编码 
	header('Content-Type: text/plain'); 			//纯文本格式 
	header('Content-Type: image/jpeg'); 			//JPG、JPEG 
	header('Content-Type: application/zip'); 		// ZIP文件 
	header('Content-Type: application/pdf'); 		// PDF文件 
	header('Content-Type: audio/mpeg'); 			// 音频文件 
	header('Content-type: text/css'); 				//css文件
	header('Content-type: text/javascript'); 		//js文件
	header('Content-type: application/json'); 		//json
	header('Content-type: application/pdf'); 		//pdf 
	header('Content-type: text/xml');				//xml
	header('Content-Type: application/x-shockw**e-flash'); //Flash动画 

	/* 声明一个下载的文件 */
	header('Content-Type: application/octet-stream'); 
	header('Content-Disposition: attachment; filename="ITblog.zip"'); 
	header('Content-Transfer-Encoding: binary'); 
	readfile('test.zip');

	/* 对当前文档禁用缓存 */
	header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate'); 
	header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); 

	/* 显示一个需要验证的登陆对话框 */
	header('HTTP/1.1 401 Unauthorized'); 
	header('WWW-Authenticate: Basic realm="Top Secret"'); 

	/* 声明一个需要下载的xls文件 */
	header('Content-Disposition: attachment; filename=ithhc.xlsx');
	header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
	header('Content-Length: '.filesize('./test.xls')); 
	header('Content-Transfer-Encoding: binary'); 
	header('Cache-Control: must-revalidate'); 
	header('Pragma: public'); 
	readfile('./test.xls');