XHTML
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How I use XHTML on my site
Even though it's "considered harmful" to serve XHTML as text/html, if a browser doesn't support application/xhtml+xml (i.e. IE), you can't serve it with the appropriate MIME type. So, I do sniffing:
<?php
function sendContentType($type, $charset = 'UTF-8'){
$types = array( #just for convenience
'rss'=>'application/rss+xml', 'xhtml'=>'application/xhtml+xml',
'atom'=>'application/atom+xml', 'html'=>'text/html'
);
$xml_types = array('application/rss+xml','application/atom+xml');
$xml_fallbacks = array('application/xml', 'text/xml');
$type = g($types, $type, $type);
$accept = g($_SERVER, 'HTTP_ACCEPT');
if($accept) $accept = strtolower($accept);
# if accept header isn't given, there's nothing you can do.
# If it's an "HTML" mime type, send text/html. Otherwise, send the given mime type
if($type == $types['xhtml'] and (!$accept or (strpos($accept, $type) === false))){
$type = $types['html'];
}elseif($accept and in_array($type, $xml_types)){
#if you're sending an xml-based file format, but the client doesn't accept the specific mime type,
# just send as XML
array_unshift($xml_fallbacks, $type);
foreach($xml_fallbacks as $test){
if(strpos($accept, $test) !== false){
$type = $test;
break;
}
}
}
header("Content-type: $type; charset=$charset");
return $type;
}
#Then in my header template
$content_type = sendContentType('xhtml');
if($content_type != 'text/html'){?><?xml version="1.0" encoding="UTF-8"?><?php }?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
... and so on
g defined here
And, here's a standalone beginning incantation for XHTML so I don't have to piece it together from my header source every time:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<meta http-equiv="Content-Script-Type" content="text/javascript" />
<title>Testing</title>
</head>
<body>
...
</body>
</html>
Page last edited: February 19, 2006 (utc)
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