来自：http://phpweby.com/tutorials/php/35
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PHP is not limited to outputting html. PHP can output images, pdf, javascript files, etc. Browsers determine what type of content is by analyzing the headers sent. In this tutorial I will present you with some examples of how to send headers. To send PHP header use the function header(). You must call this function before any output. Use the function headers_sent() to check whether the headers have been sent and output started.?
301 moved permanently (redirect):?
<?php?
header('HTTP/1.1?301?Moved?Permanently');
header('Location:?http://www.example.com');
die();
?>?
302 moved temporarily(redirect):?
<?php?
header('Location:?http://www.example.com');
die();
?>?
404 Page Not Found:?
<?php?
header('HTTP/1.1?404?Not?Found');
?>?
Service not avaliable:?
<?php?
header('HTTP/1.1?503?Service?Temporarily?Unavailable');
header('Status:?503?Service?Temporarily?Unavailable');
header('Retry-After:?60');
?>?
CSS:?
<?php
header('Content-Type:?text/css');
?>?
Javascript header:?
<?php?
header('Content-Type:?application/javascript');
?>?
Images:
For JPEG(jpg):?
<?php?
header('Content-Type:?image/jpeg');
?>?
For PNG:?
<?php?
header('Content-Type:?image/png');
?>?
For BMP:?
<?php?
header('Content-Type:?image/bmp');
?>?
PDF (output pdf with php):?
<?php?
header('Content-Type:?application/pdf');
echo?file_get_contents('filename.pdf');
?>?
Cache (force browsers not to cache files):?
<?php?
header('Expires:?Sat,?26?Jul?1997?05:00:00?GMT');
header('Cache-Control:?no-store,?no-cache,?must-revalidate');
header('Cache-Control:?pre-check=0,?post-check=0,?max-age=0');
header?('Pragma:?no-cache');?
?>?
Download dialog:?
<?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($f);
?>?
Authentication (force the browser to pop up a Username/Password input window) - only available when PHP is running as an Apache module:?
<?php
if?(!isset($_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';
????die();
}?else?{
//always?escape?your?data//
$user='user';
$pass='pass';
???if($_SERVER['PHP_AUTH_USER']==$user?&&?$_SERVER['PHP_AUTH_PW']==$pass){
????echo?'Authorized';
}
}
?>
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php header编码
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header("Content-type: text/html; charset=utf-8");?
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