How to break/validate input?

Question

PHP

What can be fed to input to check character escaping and/or to check for vulnerabilities/defects? Any quotes, special characters, etc.
Maybe you have some kind of pre-prepared string that you enter for verification?

Answer 1

What exactly do you want to check? If the form itself, then escape the quotes 《"》. And writing the entered data to the database and displaying it on the page is another story.