php语法如何做一个实心菱形（while循环）

php语法中如何利用while循环做一个实心菱形效果，下面编程教程网小编给大家简单介绍一行具体实行代码！

代码如下：

<?php
  $rows = 9;
  $i = 0;
  $j = 0;
  while($i < $rows)
  {
    $j = 0;
    while($j < ($rows - $i))
    {
      echo " ";
      $j++;
    }
 
    $j = 0;
    while($j < (2 * $i - 1))
    {
      echo "*";
      $j++;
    }
     
    echo "\n";
    $i++;
  }
  
  $i = $rows-2;
  while($i >= 0)
  {
    $j = 0;
    while($j < ($rows - $i))
    {
      echo " ";
      $j++;
    }
     
    $j = 0;
    while($j < (2 * $i - 1))
    {
      echo "*";
      $j++;
    }
     
    echo "\n";
    $i--;
  }
?>