<?php
 
 
    function isPrime(int $n) : int {
 
            $i = 2; 
 
            $prime = 1;
 
            if($n == 0 || $n == 1) return 0;
 
             while(($i * $i) <= $n && $prime) { 
 
                   $prime = ($n % $i != 0);    
 
                   $i++;  
             }
 
         return $prime;
    }
 
 
    function Primes(int $n) {
 
             for($i = 2; $i <= $n; $i++) {
 
                 if(isPrime($i)) yield $i;
             }
    }
 
    foreach(Primes(100) as $prime) {
 
            echo$prime. ' , ';
    }                     
    ?>

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10