We create and associate a set of “validation descriptors” with each element in the form.
The “validation descriptor” is a string specifying the type of validation to be performed.
Note: You can make web forms quickly with Simfatic Forms.
As you have seen in the previous tutorial, the process of capturing and displaying the submitted form data is quite simple.Sure, it may not look nice and tell you someone has been trying to mess with your script, but the important thing is he/she had failed! If you know exactly what kind of data to expect you can make further steps to ensure the user has entered what you want. Instead of writing the same code over and over again we can create a function that will do all the checking for us.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.Most of cases we will use the * symbol for required field.Validation means check the input submitted by the user.
There are two types of validation are available in PHP.