What are some best practices for validating HTML output generated by PHP scripts to ensure proper formatting and security?

When generating HTML output using PHP scripts, it is important to validate the output to ensure proper formatting and security. One best practice is to use PHP's built-in functions like `htmlspecialchars()` to escape special characters in the output, preventing potential XSS attacks. Additionally, validating the HTML output against a defined schema or using a tool like W3C Markup Validation Service can help ensure the output meets web standards. 

// Example of validating HTML output using htmlspecialchars()
echo '<div>' . htmlspecialchars($userInput) . '</div>';

Keywords

HTML validation PHP scripts formatting security XSS vulnerabilities

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