What is the purpose of using HTML Purifier in PHP and what potential security risks does it aim to mitigate?

HTML Purifier is a PHP library that helps sanitize and filter HTML input to prevent XSS (Cross-Site Scripting) attacks. It aims to mitigate security risks by removing potentially harmful HTML and scripting code from user input, ensuring that only safe and valid HTML is displayed on the web page. 

// Example of using HTML Purifier to sanitize user input
require_once 'path/to/HTMLPurifier.auto.php';

$config = HTMLPurifier_Config::createDefault();
$purifier = new HTMLPurifier($config);

$dirty_html = $_POST['user_input'];
$clean_html = $purifier->purify($dirty_html);

echo $clean_html;

Keywords

HTML Purifier PHP security risks mitigation XSS

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