Php code in xml.php file

Question

I'm working on xml.php file structured below:

<?php
    $xmlstr = <<<'XML'
    <?xml version='1.0' standalone='yes'?>

<root>
  <subroot>
    <![CDATA[

... some php code here ...

            ]]>
  </subroot>
</root>

    XML;
    ?>

I want to add the below php code between CDATA so that we can call it later through index.html file:

        <?php 
          include $_SERVER['DOCUMENT_ROOT'].'xml.php';  
          $template = new SimpleXMLElement($xmlstr); 
          echo $articles->article[0]->name; 
        ?>

However, it doesn't work like this and have run out of ideas on how can we make it to work. Any suggestions?

that's not a valid xml, you need <?xml version='1.0' standalone='yes'?><root><![CDATA]]></root> — cske
– cske, Commented Oct 1, 2016 at 6:48
I think that your observation is correct and I have just include cdata between subroot element which is part of the root element. And according to akrys suggestion I change the last line of the code from XML to 'XML'. — John Greg
– John Greg, Commented Oct 30, 2016 at 9:59

akrys · Accepted Answer · 2016-10-01 08:33:55Z

Problem:

Your XML string needs an element you can address. At least a root element should be defined in your XML string. Usually it's called root.

Problem

Your XML is defined in heredocs, which behaves like a string in double quotes. This means all variables are parsed, while the string is stored into $xmlstr.

So, you wont't get valid source code, after storing it to $xmlstr.

You'll need to define this single quotes. Then your variables aren't parsed and replaced. That can be done using nowdoc (avaliable as of PHP 5.3). You'll just have to add two single quote signs (<<<'XML' instead of <<<XML)

So, after all, your xml.php code (as I understand you) would look like this:

<?php
$xmlstr = <<<'XML'
<?xml version='1.0' standalone='yes'?>
<root>
<![CDATA[
    <?php 
    include $_SERVER['DOCUMENT_ROOT'].'xml.php';  
    $template = new SimpleXMLElement($xmlstr); 
    echo $articles->article[0]->name; 
    ?>
]]>
</root>
XML;


$x = new SimpleXMLElement($xmlstr);
print (string)$x; //prints the code as it is defined in $xmlstr

Details to heredoc and nowdoc can be found here: https://secure.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc https://secure.php.net/manual/en/language.types.string.php#language.types.string.syntax.nowdoc

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