A simple PHP function to fetch the current page URL with PHP, .htaccess rewrites are respected and optionally you can exclude the query string, useful for creating canonical URLs.

currentPageURL.php

<?

function currentPageURL($includeQueryString = true) {
	$pageURL = 'http';
	$pageURL .= ($_SERVER["HTTPS"] == "on") ? "s" : ""; 
	$pageURL .= "://";
	$pageURL .= ($_SERVER["SERVER_PORT"] != "80") ? $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"] : $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
	if (!$includeQueryString) {
		$pageURL = str_replace('?'.$_SERVER["QUERY_STRING"], '', $pageURL);
	}
	return $pageURL;
}

?>