Using PHP Constants

<?php show_source(end(explode('/',$_SERVER['PHP_SELF']))); echo "<hr>"; ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title>Using PHP Constants</title>
</head>
<body>
<?php
    echo 'The version of PHP is: ' . PHP_VERSION . '<br />';
    echo 'The server operating system is: ' . PHP_OS . '<br />';

    echo 'File: ' . __FILE__ . ' on line: ' . __LINE__ . '<br />';
    echo 'File: ' . __FILE__ . ' on line: ' . __LINE__ . '<br />';
?>
</body>
</html>

Using PHP Constants The version of PHP is: 8.3.30
The server operating system is: Linux
File: /home/staff/celio/public_html/inf533-2009/php5-bluebook/ch 02/task 20/UsingConstants_.php on line: 14
File: /home/staff/celio/public_html/inf533-2009/php5-bluebook/ch 02/task 20/UsingConstants_.php on line: 15