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Content Negotiation (See related posts)

Serve XHTML as application/xhtml+xml to browsers which accept it (and to W3C Validator).

<?php 
header("Vary: Accept");
if (stristr($_SERVER['HTTP_ACCEPT'], 'application/xhtml+xml') || stristr($_SERVER["HTTP_USER_AGENT"],"W3C_Validator"))
{
  header('Content-type: application/xhtml+xml');
  echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
}
else
{
  header('Content-type: text/html');
}
?>
to php content_negotiation MIME-type by Syam on Thu Apr 21 22:41:13 -0400 2005

Comments on this post

d2s posts on Aug 08, 2005 at 20:41
Thanks much for code. This is just what I was looking for.
d2s posts on Aug 19, 2005 at 12:40
I think that it should send character encoding with text/html header.

  header('Content-Type: text/html; charset=UTF-8');

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