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After writing the code, save the file and name it . You can then include the file in the contact form page using the Include function. Since we have saved all the form's data, we can run it through the validation script. To check if any fields are left empty, we use the empty function and pass parameters to it. Empty Empty Empty All fields are required If any field is left empty, an error message will appear on the screen. If the variable contains no value, the empty function returns . Empower your team. Lead the industry. Subscribe to a library of online courses and digital learning tools for your organization via . The username can then be checked against various validation points, such as minimum or maximum length.

 The code that performs this type of validation is as follows: The code above checks whether the number of characters in the entered username is greater than or equal to Phone Number List and less than or equal to . The function returns the number of characters present in the passed argument. Sometimes you also need to check for inappropriate characters. The following code is an example of this type of validation: Returns true; else Please enter a valid username The function matches the regular expression passed as argument. The above regex only accepts alphanumeric values containing only underscore as a special symbol. Illegal characters are not accepted. Regular expressions are sequences of characters used to pattern match strings.



 Verify email: The email field is verified by two things. First, it cannot be empty and the email entered must be valid. Echo email. Email has been accepted. Other echo emails. Email is invalid.   the email address. The regular expression is stored in a variable and passed into the function to compare email address values. Only accept email addresses that match the regular expression.