Web Development Exercise 4-2

I need help with a Computer Science question. All explanations and answers will be used to help me learn.

In this exercise, you will create an All-in-One form that is a work-

                  ing “Contact Me” page. This page will have inputs for the subject,

                  the sender’s name, the sender’s e-mail address, and the message. The

                  form will also send a copy of the message to the sender.

                     1.   Create a new document in your text editor. Type the

                          !DOCTYPE declaration,  element, header information,

                          and  element. Use the strict DTD and “Contact Me” as

                          the content of the  element.
                     2.   Add the opening and closing tags for the PHP script section

                          in the body of the document:

                          <?php

                          ?>
3.   Add a function called validateInput(). This function takes

     two parameters. The ?rst parameter, $data, is a string to be

     validated. The second parameter, $?eldName, is the name

     of the form ?eld. The function returns the $data parameter

     after it has been cleaned up. Notice that the function uses the

     global variable $errorCount.

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     function validateInput($data, $?eldName) {

          global $errorCount;

          if (empty($data)) {

               echo ""$?eldName"" is a required ?eld.n"";