header() 函数向客户端发送原始的 http 报头。
认识到一点很重要,即必须在任何实际的输出被发送之前调用 header() 函数(在 php教程 4 以及更高的版本中,您可以使用输出缓存来解决此问题):
// 结果出错
// 在调用 header() 之前已存在输出
header('location: http://www.111cn.net/');
?>语法
header(string,replace,http_response_code)参数 描述
string 必需。规定要发送的报头字符串。
replace 可选。指示该报头是否替换之前的报头,或添加第二个报头。
默认是 true(替换)。false(允许相同类型的多个报头)。
http_response_code 可选。把 http 响应代码强制为指定的值。(php 4 以及更高版本可用)
function downfile()
{$filename=realpath("resume.html");
header( "content-type: application/octet-stream ");
header( "accept-ranges: bytes ");
header( "accept-length: " .filesize($filename));
header( "content-disposition: attachment; filename= 4.html");
echo file_get_contents($filename);
readfile($filename);
}
downfile();?>
function downfile($fileurl)
{
$filename=$fileurl;
$file = fopen($filename, "rb");
header( "content-type: application/octet-stream ");
header( "accept-ranges: bytes ");
header( "content-disposition: attachment; filename= 4.doc");
$contents = "";
while (!feof($file)) {
$contents .= fread($file, 8192);
}
echo $contents;
fclose($file);}
$url=$_request['url'];
$url="http://www.111cn.net";
downfile($url);?>

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