What are the best practices for handling SVG namespaces in PHP-generated XHTML documents?

When generating XHTML documents with PHP that include SVG elements, it is important to handle namespaces properly to ensure the SVG elements are rendered correctly. One common issue is that SVG elements need to be in the SVG namespace, which can be achieved by using the `xmlns` attribute in the root `<svg>` element. Additionally, any SVG elements within the document should also be prefixed with the SVG namespace. 

&lt;?php
// Start output buffering
ob_start();

// Output the XML declaration and DOCTYPE
echo &#039;&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;&#039;;
echo &#039;&lt;!DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML 1.0 Strict//EN&quot; &quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd&quot;&gt;&#039;;

// Start the XHTML document
echo &#039;&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;&#039;;

// Start the SVG namespace
echo &#039;&lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot;&gt;&#039;;

// Output SVG elements with the proper namespace
echo &#039;&lt;rect xmlns=&quot;http://www.w3.org/2000/svg&quot; x=&quot;10&quot; y=&quot;10&quot; width=&quot;100&quot; height=&quot;100&quot; fill=&quot;red&quot;/&gt;&#039;;

// Close the SVG namespace
echo &#039;&lt;/svg&gt;&#039;;

// Close the XHTML document
echo &#039;&lt;/html&gt;&#039;;

// Get the buffered output
$output = ob_get_clean();

// Output the final XHTML document
echo $output;
?&gt;

Keywords

SVG namespaces PHP XHTML documents

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