php輸出直立金字塔

   $a = 10;
    function           //定義一個函數zjt()
        {
            for($i = 1;$i                 for($j = 1;$j                               echo" ";
     
                       for($k = 1;$k                                }
                            }
zjt($a);                                




   $a = 20;
   function dzjt($a)                 // 定義了一個dzjt（）的函數

   {
       global $ ($i = 1;$i

           {
                echo   for($k = 1;$k       " ;
            }
            echo "
";
  */                                   



   echo '1~100的質數：';
   for( $i = 2;$i    {
         $a = 1;         的數值來表示$i是否能被其他數字（除了1和本身）整除
         for($j = 2;$j          {
                              $a = 0;                     break;
}
         }
          if($a == 1)                 {
               echo $i." " ; ;     
   echo '1~100的素數總和:'

   $sum = 0;
   for($i = 2;$i               for($j = 2;$j            {
                  if($i % $j == 0)
                  {
                       $a = 0;
                       break;
                  }
             }
         if($a == 1)
         {
             $sum = $sum + $i;
         }
     }
  echo "$sum";