This perimeter protects the core business logic, processing and output generation.Beyond the perimeter is everything considered potential enemy territory which is...literally everything other than the literal code executed by the current request.Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.Data validation rules may be defined, designed and deployed, for example: Definition and design contexts: Data that does not conform to these rules will negatively affect business process execution.PHP has a function called mysql_real_escape_string() that helps prevent injection.Before you use this function, you should still validate all the data and sanitize it, to make sure it’s clean.We’ll also explore how those validation methods interact with your model’s attributes and how Laravel’s built-in error-messaging system can be used effectively in your application’s user interface to provide descriptive feedback.Validations are used to ensure that the data is of a certain format, type, length, or value.

Thankfully, Laravel has a library, aptly named “Validation” that will do all the hard work for us and make this mundane part of programming as simple and as easy as possible.Some bad guy came along and decided to change the value in the hidden form from a number to ‘OR 1’.Now, if this was used to query for one user, it would actually pull all the users from the table because when you change the script to WHERE user_id = ‘’ OR 1, it will pull all the rows from the table. Luckily, this is a beginner’s guide, so we have the perfect beginner’s method for you!Plus, learn how to email form data and save it in a My SQL database so that it's ready for other applications.Input Validation is the outer defensive perimeter for your web application.