What potential issues can arise when using a function to clean up HTML code in PHP?

One potential issue that can arise when using a function to clean up HTML code in PHP is the removal of necessary tags or attributes that are essential for the functionality or styling of the webpage. To solve this issue, you can use a library like HTML Purifier which allows you to configure specific rules for cleaning up HTML code while preserving necessary elements. 

// Example using HTML Purifier to clean up HTML code
require_once 'path/to/htmlpurifier/library/HTMLPurifier.auto.php';

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

$dirty_html = "<p>This is <span style='color:red;'>dirty</span> HTML code</p>";
$clean_html = $purifier->purify($dirty_html);

echo $clean_html;

Keywords

XSS htmlspecialchars htmlentities strip_tags security

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