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The second argument is the validation descriptor that tells the type of the validation required.
The third argument is the error message to be displayed if the validation fails.
(note that the form method is post in the HTML form).
To make it a bit cleaner, we can trim the input to remove any extra space from the beginning and end of the form.
Form security (preventing exploits like SQL injection, XSS attacks etc ) are to be handled in addition to form validation.
Form validation is focussed towards the user input where as the security validations should be focused on how you use the data.
We will use the same PHP function to send the emails.It is very essential to have the input to your form validated before taking the form submission data for further processing.When there are many fields in the form, the PHP validation script becomes too complex.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.
This validation descriptor is for select input items (lists) Normally, the select list boxes will have one item saying ‘Select One’.