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config.php file
<?php
/*--Config--*/
$db_name = "koncms";
$db_user = "root";
$db_pass = "dont look :O";
$db_host = "localhost";
//////////////////////////////
define(DB_NAME, $db_name);
define(DB_USER, $db_user);
define(DB_PASS, $db_pass);
define(DB_HOST, $db_host);
//////////////////////////////
?>
index.php file
<html>
<body>
<?php
include config.php;
$con = mysql_connect(DB_HOST,DB_USER,DB_PASS);
if (!$con)
  {
  die('Failed: ' . mysql_error());
  }
else
  {
  echo "connected";
  }
?>
</body>
</html>

error:
root@home-System-Product-Name:/var/www/cms# php index.php
<html>
<body>
PHP Notice:  Use of undefined constant config - assumed 'config' in /var/www/cms/index.php on line 4
PHP Notice:  Use of undefined constant php - assumed 'php' in /var/www/cms/index.php on line 4
PHP Warning:  include(configphp): failed to open stream: No such file or directory in /var/www/cms/index.php on line 4
PHP Warning:  include(): Failed opening 'configphp' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/cms/index.php on line 4
PHP Fatal error:  Call to undefined function mysql_connect() in /var/www/cms/index.php on line 5