functionis_HTTPS(){if(!isset($_SERVER['HTTPS']))returnFALSE;if($_SERVER['HTTPS']===1){//ApachereturnTRUE;}elseif($_SERVER['HTTPS']==='on'){//IISreturnTRUE;}elseif($_SERVER['SERVER_PORT']==443){//其他returnTRUE;}returnFALSE;}




也有这样用的：

if(strtoupper($_SERVER['HTTPS'])=='ON'){...}