Are there any PHP functions or libraries that can help with filtering out disallowed HTML tags automatically?

When dealing with user input that contains HTML content, it is important to filter out disallowed HTML tags to prevent security vulnerabilities such as cross-site scripting (XSS) attacks. One way to automatically filter out disallowed HTML tags is to use the strip_tags() function in PHP. This function allows you to specify which tags are allowed and which should be removed from the input. 

// Define the allowed HTML tags
$allowed_tags = '<p><a><strong><em><ul><ol><li>';

// Filter out disallowed HTML tags
$filtered_content = strip_tags($user_input, $allowed_tags);

// Output the filtered content
echo $filtered_content;

Keywords

PHP HTML filtering functions libraries

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