How can one ensure that the HTML content being transformed is valid XHTML for successful XSLT processing?

To ensure that the HTML content being transformed is valid XHTML for successful XSLT processing, one can use a tool like Tidy to clean up and convert the HTML to well-formed XHTML before applying the XSLT transformation. This will help ensure that the input XML is in a format that the XSLT processor can properly parse and transform. 

$html = '<html><head><title>Example</title></head><body><h1>Hello, world!</h1></body></html>';

// Use Tidy to clean up and convert HTML to well-formed XHTML
$tidy = new tidy;
$tidy->parseString($html, array('output-xhtml' => true, 'show-body-only' => true), 'utf8');
$tidy->cleanRepair();

$xhtml = $tidy;

// Apply XSLT transformation to the valid XHTML content
$xslDoc = new DOMDocument();
$xslDoc->load('stylesheet.xsl');

$xmlDoc = new DOMDocument();
$xmlDoc->loadXML($xhtml);

$proc = new XSLTProcessor();
$proc->importStylesheet($xslDoc);

echo $proc->transformToXML($xmlDoc);

Keywords

XHTML XSLT HTML content validation PHP.

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