php中header用法

<?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.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、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\'); ######
?>