What PHP functions can be utilized to remove or replace HTML tags in a string?

When working with HTML content in PHP, there may be cases where you need to remove or replace HTML tags from a string. This can be done using PHP functions like strip_tags() to remove all HTML tags, or using functions like htmlspecialchars() to convert HTML tags to their respective entities. These functions help sanitize user input or format HTML content as needed.

// Remove all HTML tags from a string
$cleanString = strip_tags($htmlString);

// Replace HTML tags with their respective entities
$escapedString = htmlspecialchars($htmlString);