在php中打印1到100个素数

Question

如何在php中打印前100个素数并在此代码中解释我的错误

<?php
for($i=1;$i<=100;$i++){
for($j = 1; $j<=$i; $j++){
 $temp = $i%$j;
 if($temp == 1){
 echo "is a prime number &nbsp; ".$j."<br>";
 }
}
}
?>

Answer 1

对于素数这里的基本答案

function primeno($n){

  for($i=1;$i<=$n;$i++){  //numbers to be checked as prime

          $counter = 0; 
          for($j=1;$j<=$i;$j++){ //all divisible factors


                if($i % $j==0){ 

                      $counter++;
                }
          }

        //prime requires 2 rules ( divisible by 1 and divisible by itself)
        if($counter==2){

               print $i." is Prime <br/>";
        }
    }
} 

primeno(100);  //find prime numbers from 1-100