Hi, please help

I need to terminate a variable name so it does not run into the next word....

<?PHP

$foo = "hello world";
$foobar = "hello universe";

echo <<<QUOTE
<b>$foo</b> As expected<br />
<b>$foobar</b> As expected<br />
<b>$foobar</b> No, I need it to print '<b>hello worldbar</b>'<br />


QUOTE;


echo '<b>'.$foo.'</b> As expected<br /><b>'.$foobar.'</b> As expected<br /><b>'.$foo.'bar</b>';

?>