Need Help with user authentication system!

[Junior]

Hi guys,

I'm making a custom CMS for a blog. I've planned to do everything including the user authentication by myself. I'm going to hash passwords and store everything in a MySQL database.

Since I'm not an expert at this, what should I be looking out for? How do I avoid getting hacked?

[menlawre]

You will need to make sure your user input is clean. php has many functions that you can use. For example, the strip_tags() function strips out any html tags so someone can't enter javascript into the fields.