PHP - check if number is prime

Question

I\'m trying to create a function which checks whether the number is prime or not. BUT I want this function to echo to the user \'prime\' or \'NOT prime\' - and that\'s where my

Answer 1

As many answer pointed out, your logic code has a problem: when you get i such that num % i == 0, you print "NOT prime" and quit the loop, after that, you still print "Prime". Some guys moved echo "Prime" in if-else, it is still wrong. One way to approach, for example,

class IsPrime
{       
     function check($num)
     {
        $bCheck = True; 
        for ($i = 2; $i < $num; $i++)
        {
            if ($num % $i == 0) 
            {
                 $bCheck = False;
                 break;
            }               
        }
       if $bCheck 
          echo 'Prime';           
       else
          echo 'NOT prime'; 
     }       
  }

 $x = new IsPrime();
 $x->check(4);