Regarding header error in PHP
Using multiple header in php page. if header is once called from another file and is in session and ur using another \header page for error page oor not authorized page then use include function in place for calling header
Using multiple header in php page. if header is once called from another file and is in session and ur using another \header page for error page oor not authorized page then use include function in place for calling header
header(location:'error.php');
in place of this use include function
include('error.php');