is_prime_number.php

is_prime_number.php

<?pphp
/**
 * Check if a number is a prime number
 * @param int $n The number.
 * @retun boolean True if $n is a prime number, false otherwise.
 */
function is_prime_number($n) {
  $is_prime = true;
  $max_count = ceil($n/2);
  for($i=2; $i<$max_count; $i++) {
    if($n%$i==0) {
      $is_prime = false;
      break;
    }
  }
  return $is_prime;
}