PHP variables always start with a $. The following is an html
file which uses variables. Some points:
Example
<html> <body> <?php // PHP variables always start with $. $jake = 4; $allen = 3 + $jake; echo $jake, " ", $allen ?>
<hr> Some html goes here.... <br>
<script language="php"> // This is another wayt to enter PHP. And variable values survive between // PHP regions. echo '$jake has the value ', $jake, ".<br>"; </script>
<i>This is more HTML.</i>
<p> <table> <?php // There are many pre-defined variables which describe the script's // environment.
echo "<tr><td><b>My URL is:</b>:</td><td>http://", $_SERVER["SERVER_NAME"], ":", $_SERVER["SCRIPT_NAME"], "</td></tr>"; echo "<tr><td><b>Your browser is</b>:</td><td>", $_SERVER["HTTP_USER_AGENT"], "</td></tr>"; echo "<tr><td><b>Your IP address is</b>:</td><td>", $_SERVER["REMOTE_ADDR"], "</td></tr>"; ?> </table></p> </body> </html>
Try it out now
Constants can be simply defined as follows
<?php // Works as of PHP 5.3.0 const CONSTANT = 'Hello World'; echo CONSTANT; ?>