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Using a Pair of Functions

Again, your new script will generate the traditional "Hello, World!" greeting. However, this time you will store the pair of functions in a separate file. If you are creating a large web site, this technique allow you to have a degree of uniformity, because the scripts for any of the pages can call on the functions without redefining them. Follow the simple steps below.

Get to the directory where you are storing your PHP code.

Create a new file called helloworld5.php so that it looks like the following code.

<?php
// PHP echoing "Hello World in HTML"
// Using functions in the file commonhtml.inc
// helloworld5.php
require ('commonhtml.inc');

$title = "Hello Using Functions";
htmlheader($title);
echo "  <p>Hello, World!</p>\n";
htmlfooter();
?>

In the same directory, create a file called commonhtml.inc in which you will have the definitions of the two functions.

<?php
// Functions for HTML tasks
// commonhtml.inc
function htmlheader ($t)
{
  echo "<html>\n";
  echo " <head>\n";
  echo "  <title>" . $t . "</title>\n";
  echo " </head>\n";
  echo " <body>\n";
}
function htmlfooter ()
{
  echo " </body>\n";
  echo "</html>\n";
}
?>

In your favorite web browser, type
```
http://localhost/~YOURID/test_php/helloworld5.php
```
where YOURID is the user ID you have on the system.

Notes

There are other ways of using require which make it look less like a function:
require 'commonhtml.inc';
require $myincludefile;