Updated 2/23/2020 at 8:50pm

Homework #3: Functions and Variable Scope

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• Remember to follow all the standard Homework Requirements.
  
  
• This assignment will demonstrate:
  • PHP custom functions
  • Variable scope
  
  
• Make a new page for your site, and name it products.php. This will be a "Products" page.
  
  
• Put an HTML link on your index.php page, which allows someone to navigate to your new "Products" page.
  
  
• Write a PHP function in the products.php page, which adds two numbers and returns the sum.
  
  
• Use the print() function to display the return from the function in the body of the Products page.
  
  
• You can use the following code to get started. (WARNING: There is a major bug in this code. Part of this assignment is to fix the bug.)

      <?php
        $number1 = 12;
        $number2 = 13;
        print numberStuff();
        
        function numberStuff()
        {
          $sum = $number1 + $number2;
          return $sum;
        } 
      ?>
  

• In order to get started with the debugging, copy and paste the above code into your Products page, upload it to your class Web site, and display the Products page. You might see some Notice: messages regarding Undefined variables. You will certainly see the wrong sum displayed in the page.
  
  
• There are at least two different ways to fix the bug:
  1. Pass the variables $number1 and $number2 into the function as parameters.
  2. Add two "global" statements at the start of the function.
  
  
• Test your page on the PHP Web server by clicking your student number on the "Student Sites" page of this class site. Display your Products page. Make sure the Products page displays the correct sum.