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

function pyramid($height)
{

    for ($i = 1; $i <= $height; $i++) {
        echo str_repeat("&nbsp;&nbsp;", $height - $i);
        echo str_repeat('*', $i * 2 - 1) . '<br/>';
    }

}


pyramid(5);

Answer 2

    $n1=10;
    $k=$n1/2;
    $n=$n1/2;

    for($i=0 ; $i<=$n1 ; $i++) {
        if($i <= $n1/2) {   
            $k=$k+1;
            $n=$n-1;    
        } else {
            $k=$k-1;
            $n=$n+1;
        }

        for($j=0 ; $j<=$n1 ; $j++) {    
            if($j < $k && $j > $n) {
                echo "*";   
            } else {
                echo "&nbsp;&nbsp";
            }
        }

        echo "<br/>";
    }

Answer 3

Diamond Shape

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



<?php
        $num=15;
        $num2=0;
        $half = $num;
            for($i=$num2; $i<=$num; $i++)
            {       
                for($j=$half; $j>$i; $j--)
                {
                    echo "&nbsp;&nbsp;";    
                }
                for($j=$num2; $j<=$i; $j++)
                {
                    echo "&nbsp;*&nbsp;";   
                }
                echo "<br>";
            }

            for($i=$num2; $i<=$num; $i++)
            {       
                for($j=$num2; $j<=$i; $j++)
                {
                    echo "&nbsp;&nbsp;";    
                }
                for($j=$half; $j>$i; $j--)
                {
                    echo "&nbsp;*&nbsp;";
                }
                echo "<br>&nbsp;";

            }

    ?>

Answer 4

I think that the simplest solution is to create 2 loops with condition:

$n = 5; // specify how many rows you want to
$stars = 0;

for ($i = $n; $i > 0; $i--) {
    for ($j = 0; $j < $i + $stars; $j++) {
        if ($j < $i - 1) {
            echo " ";
        } else {
            echo "*";
        }
    }

    $stars += 2;
    echo "\n";
}

The output will be:

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

Answer 5

I prefer mine :

  echo '<pre>';

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

  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:

<?php

$n = 8;

ob_start();

$stars = ($n - 1) * 2 + 1;
$spaces = 0;
for ($i = 0; ($i < $n); $i++) {
    echo str_repeat(' ', $spaces);
    echo str_repeat('*', $stars);
    echo ' ';
    echo str_repeat(' ', $spaces * 2);
    echo str_repeat('*', $stars);
    echo "\n";
    $spaces += 1;
    $stars -= 2;
}

$stars = ($n - 1) * 2 + 1;
$spaces = 0;
$margin = $stars / 2 + 1;
for ($i = 0; ($i < $n); $i++) {
    echo str_repeat(' ', $margin);
    echo str_repeat(' ', $spaces);
    echo str_repeat('*', $stars);
    echo "\n";
    $spaces += 1;
    $stars -= 2;
}

echo trim(implode("\n", array_reverse(explode("\n", ob_get_clean()))), "\n"), "\n";

it gives:

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

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

Answer 6

You can try

create_pyramid("*", 5);
create_pyramid("@", 10);
create_pyramid("^_^", 10);

function create_pyramid($string, $level) {
    echo "<pre>";
    $level = $level * 2;
    for($i = 1; $i <= $level; $i ++) {
        if (!($i % 2) && $i != 1)
            continue;   
        print str_pad(str_repeat($string, $i),($level - 1) * strlen($string), " " , STR_PAD_BOTH);
        print PHP_EOL;
    }
}

Output A

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

Output B

         @         
        @@@        
       @@@@@       
      @@@@@@@      
     @@@@@@@@@     
    @@@@@@@@@@@    
   @@@@@@@@@@@@@   
  @@@@@@@@@@@@@@@  
 @@@@@@@@@@@@@@@@@ 
@@@@@@@@@@@@@@@@@@@

Output C

                        ^_^^_^^_^                        
                     ^_^^_^^_^^_^^_^                     
                  ^_^^_^^_^^_^^_^^_^^_^                  
               ^_^^_^^_^^_^^_^^_^^_^^_^^_^               
            ^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^            
         ^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^         
      ^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^      
   ^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^   
^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^