The function attempts to return a string with all null bytes, HTML tags stripped from the input string.
Base64 decoding is a way of translating text form into binary data so that it can be transmitted more easily via e-mail and HTML form data.Strip Tags (strips out all HTML and PHP tags from a string) is a function that allows you to strip out all HTML and PHP tags from a string, and can be used with a list of tags as well.
This function allows you to help prevent a visitor from displaying unwanted text on your site. For instance, a forum user could post a title such as THIS SITE IS SCAM! in the event that they were not happy with their experience using your site. However, if you were to use this function you could prevent the user's text from being displayed on your site.