<?php
function auto_copyright($year = 'auto'){
	if(intval($year) == 'auto'){
		$year = date('Y');
	}
	if(intval($year) == date('Y')){
		echo intval($year);
	}
	if(intval($year) < date('Y')){
		echo intval($year) . ' - ' . date('Y');
	}
	if(intval($year) > date('Y')){
		echo date('Y');
	}
}
?>
<?php auto_copyright(); // 2011?>
<?php auto_copyright('2010'); // 2010 - 2011 ?>