Raymond Irving wrote:
--- On Wed, 4/8/09, Michael A. Peters <mpeters@xxxxxxx> wrote:
From: Michael A. Peters <mpeters@xxxxxxx>
Subject: Re: How about a saveXHTML for the DOM?
saveXML() already does what is needed to provide valid
xhtml output.
From my test it sometimes generate this like at the end of the page elements. It also generate things like <script src="file.js" /> which does not work in most browsers.
<script src="foo.js />
will work on any browser that advertises it accepts the xhtml+xml mime type.
Internet exploder does not and therefore internet exploder should be
sent xhtml document. Send html documents to internet exploder.
<?php
if (! isset($usexml)) {
$usexml=1;
}
if ($usexml == 1) {
if (isset( $_SERVER['HTTP_ACCEPT'] )) {
if(! strpos( $_SERVER['HTTP_ACCEPT'], "application/xhtml+xml" ) ) {
$usexml=0;
}
} else {
$usexml=0;
}
}
?>
That will result in $usexml being set to 1 for browsers (like Firefox
and Opera) that accept xhtml+xml while setting it to 0 for browsers that
do not accept xhtml+xml.
Then when you create your DOM -
<?php
$xhtmldtd="<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\"
\"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\";>";
$htmldtd="<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01//EN\"
\"http://www.w3.org/TR/html4/strict.dtd\";>";
$myxhtml = new DOMDocument("1.0","UTF-8");
$myxhtml->preserveWhiteSpace = false;
$myxhtml->formatOutput = true;
if ($usexml == 0) {
$xmlstring = $htmldtd . "<html></html>";
} else {
$xmlstring = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" .
$xhtmldtd . "<html></html>";
}
$myxhtml->loadXML($xmlstring);
$elements = $myxhtml->getElementsByTagName("html");
$xmlHtml = $elements->item(0);
?>
You then add your children (IE head and body) to $xmlHtml.
When it comes time to serve the page -
<?php
function sendxhtmlheader($usexml) {
if ($usexml == 1) {
header("Content-Type: application/xhtml+xml; charset=utf-8");
} else {
header("Content-type: text/html; charset=utf-8");
}
}
?>
makes sure the right header describing the content is set.
Send the page like this:
<?php
if ($usexml == 0) {
print $myxhtml->saveHTML();
} else {
print $myxhtml->saveXML();
}
?>
That way you only send xhtml to browsers that advertised to your server
that they know what to do with the application/xhtml+xml mime type,
those that did not advertise they know what to do get the text/html mime
type and an html page.
It works extremely well in my test environment (my web app is not live
yet) for sending valid xhtml 1.1 to browsers that properly handle xhtml
and sending html 4.1 strict to browsers that do not properly handle
xhtml+xml (IE internet exploder).
As far as I can tell - as long as you aren't using an extension to xhtml
(like MathML) - the only problem where you can't produce both valid
xhtml 1.1 and html 4.01 strict from the same php code would be if you
were using the ruby (not programming language, the tags) elements that
are allowed in xhtml 1.1 but not defined in HTML 4.01
No browser I have tested with that broadcasts it accepts xhtml+xml has
ever had a problem with self closing script (or input or meta or ...) tags.
If you send xhtml with the text/plain mime type then the failure is on
your end for violating the specification and self closing script tags
are not legal.
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