Validating php Sexweb cam america
So now instead of typing the same code for each of our input fields we simply check each $_POST variable with the check_input function and that's it.
Input Validation is the outer defensive perimeter for your web application.
Each field in the form can have zero, one or more validations.
For example, the input should not be empty, should be less than 25 chars, should be alpha-numeric, etc You can associate a set of validation descriptors for each input field in the form.
The third argument is the error message to be displayed if the validation fails.
Moreover, since you are doing the same or similar validation for most of the forms that you make, just too much of duplicate effort is spent on form validations.
Note: You can make web forms quickly with Simfatic Forms.
We will cover a few samples like validating e-mail address and URLs later. Here we will name it check_input and simply call this function whenever we need to validate simple input data: Note the check_input function at the bottom.
What it does is takes the data passed to the function, strips unwanted characters (extra space, tab, newline) from the beginning and end of the data using the PHP trim() function, strips any quotes escaped with slashes and passes it through htmlspecialchars().
This perimeter protects the core business logic, processing and output generation.