Stuff

   	  <?php
  	 // is_prime(number) checks if a number is a prime number or not
  	 function is_prime($i)
  	 {
 	     if($i % 2 != 1) return false;
	     $d = 3;
  	     $x = sqrt($i);
  	     while ($i % $d != 0 && $d < $x) $d += 2;
 	     return (($i % $d == 0 && $i != $d) * 1) == 0 ? true : false;
 	 }
  	 // example: show all prime numbers between $start and $end
 	 $start = 0;
 	 $end = 1000;
 	 for($i = $start; $i <= $end; $i++)
  	 {
 	     if(is_prime($i))
  	     {
 	         echo '
	 '.$i.' ';
 	     }
	 }
	 ?>