php获取当前页面完整url地址

function get_page_url($host=0){
	$url = '';
	if($host){
		$url = (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443') ? 'https://' : 'http://';
		$url .= $_SERVER['HTTP_HOST'];
	}
	$url .= isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : urlencode($_SERVER['PHP_SELF']) . '?' . urlencode($_SERVER['QUERY_STRING']);
	return $url;
}