PHP header的一些用法

<?php
//PHP header()函数用法
/*** Function: PHP header() examples (PHP)
*/// fix 404 pages:
header('HTTP/1.1 200 OK');// set 404 header:
header('HTTP/1.1 404 Not Found');// set Moved Permanently header (good for redrictions)
// use with location header
header('HTTP/1.1 301 Moved Permanently');// redirect to a new location:
header('Location: http://www.example.org/');// redrict with delay:
header('Refresh: 10; url=http://www.example.org/');
print 'You will be redirected in 10 seconds';// you could also use the HTML syntax:// <meta http-equiv="refresh" content="10;http://www.example.org/ />// override X-Powered-By: PHP:
header('X-Powered-By: PHP/4.4.0');
header('X-Powered-By: Brain/0.6b');// content language (en = English)
header('Content-language: en');// last modified (good for caching)
$time = time() - 60; // or filemtime($fn), etc
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT');// header for telling the browser that the content
// did not get changed
header('HTTP/1.1 304 Not Modified');// set content length (good for caching):
header('Content-Length: 1234');// Headers for an download:
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="example.zip"');
header('Content-Transfer-Encoding: binary');// load the file to send:readfile('example.zip');
// Disable caching of the current document:
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
// Date in the pastheader('Pragma: no-cache');
// set content type:
header('Content-Type: text/html; charset=iso-8859-1');
header('Content-Type: text/html; charset=utf-8');
header('Content-Type: text/plain');// plain text file
header('Content-Type: image/jpeg');// JPG picture
header('Content-Type: application/zip');// ZIP file
header('Content-Type: application/pdf');// PDF file
header('Content-Type: audio/mpeg');// Audio MPEG (MP3,…) file
header('Content-Type: application/x-shockwave-flash');// Flash animation// show sign in box
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
print 'Text that will be displayed if the user hits cancel or ';
print 'enters wrong login data';/*------------的例子用于下载文件用-------------------*/function dl_file($file){//First, see if the file existsif (!is_file($file)) { die("404 File not found!"); }//Gather relevent info about file$len = filesize($file);$filename = basename($file);$file_extension = strtolower(substr(strrchr($filename,"."),1));//This will set the Content-Type to the appropriate setting for the fileswitch( $file_extension ) {case "pdf": $ctype="application/pdf"; break;case "exe": $ctype="application/octet-stream"; break;case "zip": $ctype="application/zip"; break;case "doc": $ctype="application/msword"; break;case "xls": $ctype="application/vnd.ms-excel"; break;case "ppt": $ctype="application/vnd.ms-powerpoint"; break;case "gif": $ctype="image/gif"; break;case "png": $ctype="image/png"; break;case "jpeg":case "jpg": $ctype="image/jpg"; break;case "mp3": $ctype="audio/mpeg"; break;case "wav": $ctype="audio/x-wav"; break;case "mpeg":case "mpg":case "mpe": $ctype="video/mpeg"; break;case "mov": $ctype="video/quicktime"; break;case "avi": $ctype="video/x-msvideo"; break;//The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)case "php":case "htm":case "html":case "txt": die("Cannot be used for ". $file_extension ." files!"); break;default: $ctype="application/force-download";}//Begin writing headersheader("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");//Use the switch-generated Content-Typeheader("Content-Type: $ctype");//Force the download$header="Content-Disposition: attachment; filename=".$filename.";";header($header );header("Content-Transfer-Encoding: binary");header("Content-Length: ".$len);@readfile($file);exit;}

 

/**********下載2************/
if (!@fopen($file,"r")) { die("404 File not found!"); }
header('Expires: 0');
header('Pragma: public');
header('Connection: close');
header('Cache-Control: no-cache,must-revalidate');
header('Content-Transfer-Encoding: binary');
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
//header('Content-Length: ' . filesize($file));
@readfile($file);