Including headers and footers from a page can save u alot of time and effort.
When u want to edit the header for example u only have to edit one file instead of 20+ depending on how many pages your site has.
For example your index.php or link.php will call upon the headers and footers like this.
index.php PHP Code:
<?php require_once($DOCUMENT_ROOT . '/header.php'); ?>
<hr>
<center>Web Content</center>
<hr>
<?php require_once($DOCUMENT_ROOT . '/footer.php'); ?>
Then your headers and footers would look like this:
header.php HTML Code:
<HTML>
<HEAD>
<TITLE>Test Page</TITLE>
<LINK REL=stylesheet TYPE="text/css" HREF="styles.css">
</HEAD>
<body bgcolor="#00000">
Footer.php HTML Code:
<p>Tutorial by Bluepearl Design
</BODY>
</HTML>
As u can see this is very easy, and editing copyrights etc will take no time at all
U could also add menu's using this feature which would mean changing links would only mean changing one file instead of say 20+
example: HTML Code:
<td width="100" class="menu"><?php require_once($DOCUMENT_ROOT . '/menu.inc'); ?></td>
If u dont understand any this dont hesistate to ask
[PHP] Creating Headers and Footers 
Linear Mode
