PHP export CSV

    set_time_limit (0 );
         ob_end_clean ();
         header ("Content-Type: application/force-download" );  
         header ("Content-type:text/csv;charset=utf-8" );  
         header ("Content-Disposition: filename=filename" .date ( "Ymd").".csv" );
         ob_end_flush (); 
         echo "Title 1, Title 2, Title 3\r" ;
         echo "Data 1, Data 2, Data 3\r" ;