Write <?xml?> in PHP file

Question

I have a index.php file:

<?php
// Load resources shared across the website
include '../path/to/other_file.php';
?>
<?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="es" lang="es" prefix="og: http://ogp.me/ns#">
<head prefix="article: http://ogp.me/ns/article#">
    <title>Title</title>
</head>

<body>

<!-- Code -->

</body>
</html>

When I load it, it shows nothing. I used this online tool to see what's happening. The problem occurs at line 5.

Probably it's that I'm using <? to introduce the XHTML document, but I guess PHP thinks the following word would be php (<?php //CODE ?>) instead of xml (<?xml version="1.0" encoding="UTF-8"?>)

How can I fix it? I think it's called "parsing" or "espacing" the characters.

Boris K · Accepted Answer · 2017-01-11 22:12:21Z

3

You can fix this problem using a simple echo :

include '../path/to/other_file.php';
echo '<?xml version="1.0" encoding="UTF-8"?>';
?>

answered Jan 11, 2017 at 22:12

Boris K

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Comments

Qirel · Accepted Answer · 2017-01-11 22:37:05Z

2

The problem occurs because PHP thinks you're trying to enter "PHP mode" when you're doing <?, when in fact you're trying to access XML. The simple solution to this is to disable what's called "PHP short tags", where PHP recognizes <? as a valid opening-tag.

You can do this by various methods, all which effectively do the same

Add short_open_tag=Off in your php.ini
~~Add ini_set('short_open_tag', '0'); at the top of your specified file~~
In php_value short_open_tag 0 in your .htaccess
Use <?php echo "<?xml ... ?>"; to add your XML.

edited Jan 11, 2017 at 22:37

answered Jan 11, 2017 at 22:20

Qirel

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2 Comments

AbraCadaver Over a year ago

Not 2 - short_open_tag is PHP_INI_PERDIR and can't be changed with ini_set(): php.net/manual/en/ini.core.php

Qirel Over a year ago

Really, @AbraCadaver? TIL! I'll strike over it!

Sysix · Accepted Answer · 2017-01-11 22:38:17Z

0

Try to send the browser, that the php file is an xml file with this line:

header("Content-type: text/xml");

put this right after you start the php tag, so script can override the header

answered Jan 11, 2017 at 22:38

Sysix

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2 Comments

Barmar Over a year ago

The problem is happening on the server, because PHP doesn't understand <?xml in a PHP script.

Mr Lister Over a year ago

While sending a MIME type header is certainly necessary for an XHTML file (otherwise the browser will think it's an HTML file), this is the the problem the OP is asking about. By the way, application/xhtml+xml is the preferred one, although text/xml will work just fine.

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