PHP - include global configuration variables to functions and classes

conf.php

<?php

//way 1
$bla = "tralala";
//way 2
$GLOBALS["blabla"] = "yoohoo";

?>

test.php

<?php

include("conf.php");

function foo() {
	//way 1
	global $bla;
	echo $bla;
	echo "<br/>";
	//way 2
	echo $GLOBALS["blabla"];
}

foo();

?>

test2.php

<?php

include("conf.php");

class Bar {
	function foo() {
		//way 1
		global $bla;
		echo $bla;
		echo "<br/>";
		//way 2
		echo $GLOBALS["blabla"];
	}
}

$bar = new Bar;
$bar->foo();

?>