php header() 函数用法归纳

301 永久重定向

<?php
header('HTTP/1.1 301 Moved Permanently');
header('Location: http://www.example.com');
exit();
?>

302 临时重定向

<?php
header('Location: http://www.example.com');
exit();
?>

404 页面未找到

<?php
header('HTTP/1.1 404 Not Found');
?>

503 服务不可用

<?php
header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Status: 503 Service Temporarily Unavailable');
exit();
?>

设置内容类型

header('Content-Type: text/html; charset=iso-8859-1');
header('Content-Type: text/html; charset=utf-8');
header('Content-Type: text/plain'); //纯文本格式
header('Content-Type: image/jpeg'); //JPG图片
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: application/x-shockwave-flash'); //Flash动画

css header

<?php
header('Content-Type: text/css');
?>

javascript header

<?php
header('Content-Type: application/javascript');
?>

images header

<?php
header('Content-Type: images/jpeg');
// header('Content-Type: images/png');
// header('Content-Type: images/bmp');
?>

PDF header

<?php
header('Content-Type: application/pdf');
echo file_get_contents('filename.pdf');
?>

缓存（cache）(force browsers not to cache files)

<?php
header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
header('Cache-Control: not-store, no-cache, must-revalidate');
header('Cache-Control: pre-check=0, post-check=0, max-age=0');
header('Pragma: no-cache'); // For IE Browsers
?>

文件下载

<?php
header('Content-Disposition: attachment;filename=' . urlencode($f));
header('Content-Type: application/force-download');
header('Content-Type: application/octet-stream');
header('Content-Type: application/download');
header('Content-Description: File Transfer');
header('Content-Length: '. filesize($f)');
echo file_get_contents($f);
?>

权限认证（force the browsers to pop up a Username/Password input window) - only available when PHP is runnig as an Apache module:

<?php
if (!isset($_SERVER['PHP_AUTH_USER'])) {
    header('WWW-Authenticate: Basic realm="The Realm"');
    header('HTTP/1.0 401 Unauthorized');
    echo 'If cancel is pressed this text shows';
    exit();
} else {
    $user='user';
    $pass='pass';
    if($_SERVER['PHP_AUTH_USER']==$user && $_SERVER['PHP_AUTH_PW']==$pass){
        echo 'Authorized';
    }
}