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Sum the number prime

/ Published in: PHP
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  1. <?php
  2.  
  3. define('N', 200);
  4.  
  5. function isPrime($num) 
  6. {
  7. 	if ($num == 2 || $num == 3) { return 1; }
  8. 	if (!($num%2) || $num<1)    { return 0; }
  9.  
  10. 	for ($n = 3; $n <= $num/2; $n += 2) {
  11. 		if (!($num%$n)) {
  12. 			return 0;
  13. 		}
  14. 	}
  15.  
  16. 	return 1;
  17. }
  18.  
  19. for ($i = 2; $i <= N; $i++) {
  20. 	if (isPrime($i)) {
  21. 		$sum += $i;
  22. 	}
  23. }
  24.  
  25. echo $sum;

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