Source code of cookie1.php
<?php
if (isset($_COOKIE['colorpref'])) {
$color = $_COOKIE['colorpref'];
} else {
$color = "#FFFFFF";
}
print <<<END_PAGE
<html>
<head><title>Cookie Demonstration</title></head>
<body bgcolor='$color'>
Customize the background color for this site:<br/>
<form action='cookie2.php' method='post'>
<input type='radio' name='bgcolor' value='#FF0000'>Red<br/>
<input type='radio' name='bgcolor' value='#00FF00'>Green<br/>
<input type='radio' name='bgcolor' value='#0000FF'>Blue<br/>
<input type='radio' name='bgcolor' value='#FFFFFF'>White<br/>
<input type='radio' name='bgcolor' value='#000000'>Black<br/>
<input type='submit' value='Use this color'>
</form>
</body>
</html>
END_PAGE;
?>