Petah/database.php

## database.php
<?php
$pdo = new PDO('mysql:host=localhost;dbname=test', 'dbuser', 'dbpassword');

## feed.php
<?php
require_once __DIR__ . '/database.php';
?>
<html>
do some html things
<?php
    foreach($pdo->query('SELECT * FROM mytable') as $row) {
        print_r($row);
    }
?>
</html>

## index.php
<?php
require_once __DIR__ . '/database.php';
?>
<html>
do some html things
</html>
	<?php
	$pdo = new PDO('mysql:host=localhost;dbname=test', 'dbuser', 'dbpassword');
	<?php
	require_once __DIR__ . '/database.php';
	?>
	<html>
	do some html things
	<?php
	foreach($pdo->query('SELECT * FROM mytable') as $row) {
	print_r($row);
	}
	?>
	</html>