How to create a link to another PHP page

Use like this

<a href="index.php">Index Page</a>
<a href="page2.php">Page 2</a>

Easiest:

<a href="page2.php">Link</a>

And if you need to pass a value:

<a href="page2.php?val=1">Link that pass the value 1</a>

To retrive the value put in page2.php this code:

<?php
$val = $_GET["val"];
?>

Now the variable $val has the value 1.