2 errors I can not understand

Hi all, Please see my output below followed by the code. I have been trying for some to figure out why 1) I can not get a line feed to work in the web page that i am using to display the output as I am not running from the commad line 2) Why my loop is only executing 3 times when i want it to execute 50 Any help would be greatly appreciated. Jonathan The next line is all that displays on the output html page: Output: The number 0 is 0 The number 1 is 0 The number 2 is 1 The number 3 is 1 php script: <html> <body> <?php for ($k=0;$k<50;$k++) { echo ("The number ".$k." is ".isprime($k)); echo "\r\n"; } function isprime ($s) { $a="2";

               switch ($s)
               {
               case "0":
               $a="0"; break;
               case "1":
               $a="0"; break;
               case "2":
               $a="1"; break;
               default:
               $d=3;
                       while ($d<$s)
                       {
                               if ($s%$d=0)
                               {
                               $a="0";
                               }
                       $d+=2;
                       }
               }

               if ($a=="2")
               {
               $a="1";
               }

return $a; } ?> </body> </html> "tjon2.php" 78L, 447C written