View Source Code

1. Design a PHP script "viewSource.php" so that when you run the script "http://STU.ipv6.club.tw/~username/viewSource.php?fn=filename.php", it will display the source code of "filename.php".
2. This can be easily done by opening a text file and print it out character by character.
3. However, please note that some entities must be handled with special care in HTML, such as the "less than" (<) or "greater than" (>) signs.
4. Test your program with an HTML file containing some tags, or a C++ program like

   
   #include <iostream>
   using std::cout;
   using std::endl;
   
   int main()
   {
       cout << "Hello" << endl;
       return 0;
   }