How can I create a pyramid from using php?

Question

I need to create a pyramid using asterisks. I specify a value which becomes the base of the pyramid. The base contains as much asterisks as the value specified and the pyram

Answer 1

I prefer mine :

  echo '
';

  $n = 5;
  function print_tree($n, $str, $max) {
    for ($i = 0; ($i < (($max - $n) / 2)); $i++) {
      echo " ";
    }
    for ($i = 0; ($i < $n); $i++) {
      echo $str;
    }
    echo "
";
  }

  for ($flag = 0; ($flag < 2); $flag++) {
    for ($a = 1, $b = 1, $c = 1, $d = 4; (($d - 3) <= $n); $a += 2, $b++) {
      if ($flag == 1) {
        print_tree($a, "*", $max);
      }
      if ($b == $d) {
        if ($flag == 0) {
          $max = $a;
        }
        if (($d - 3) != $n) {
          $a -= ((2 * $c) + 2);
        }
        $b = 0;
        $d++;
        if (($d % 2) == 0) {
          $c++;
        }
      }
    }
  }
  if ((($foot = $n) % 2) == 0) {
    $foot++;
  }
  for ($i = 0; ($i < $foot); $i++) {
    print_tree($foot, "|", $max);
  }


outputs :

                   *
                  ***
                 *****
                *******
                 *****
                *******
               *********
              ***********
             *************
              ***********
             *************
            ***************
           *****************
          *******************
         *********************
           *****************
          *******************
         *********************
        ***********************
       *************************
      ***************************
     *****************************
       *************************
      ***************************
     *****************************
    *******************************
   *********************************
  ***********************************
 *************************************
***************************************
                 |||||
                 |||||
                 |||||
                 |||||
                 |||||


Or even this one:



it gives:

               *
              ***
             *****
            *******
           *********
          ***********
         *************
        ***************
       *               *
      ***             ***
     *****           *****
    *******         *******
   *********       *********
  ***********     ***********
 *************   *************
*************** ***************


funny exercices isn't it... 8-)