What are the best practices for validating HTML in PHP code?

Validating HTML in PHP code is important to ensure that the output is well-formed and compliant with standards. One way to achieve this is by using the PHP library called "HTMLPurifier," which sanitizes and validates HTML input to prevent XSS attacks and other security vulnerabilities. 

// Include the HTMLPurifier library
require_once 'path/to/HTMLPurifier.auto.php';

// Create a new HTMLPurifier instance
$config = HTMLPurifier_Config::createDefault();
$purifier = new HTMLPurifier($config);

// Validate and sanitize HTML input
$clean_html = $purifier->purify($raw_html);

// Output the sanitized HTML
echo $clean_html;

Keywords

HTML validation PHP code validation functions error handling HTML errors

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