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 301header('Location: http://www.ithhc.cn/'); //跳转到一个新的地址header('Refresh: 10; url=http://www.ithhc.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、JPEGheader('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'); //jsonheader('Content-type: application/pdf'); //pdfheader('Content-type: text/xml'); //xmlheader('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');######