使用PHP for循环创建星型模式

Question

I'm trying to echo stars and zero like the pattern below

*
***0
******00
**********000

However I'm getting this result

    *
    **0
    ***00
    ****000
    *****0000
    ******00000

here is my code

for ($i=0; $i<=10; $i++)
{   
    echo "*";
    for ($j=0; $j<$i; $j++)
    {   
       echo "*";

    }
        for ($z=0; $z<$i; $z++)
            {
                echo "0";
            }       
    echo "</br>";    
} 
?>

Answer 1

The number of stars is indicated by triangle numbers, 1, 1+2, 1+2+3. You want to increment your inner loop max value by $i with every iteration:

$k = 0;
for ($i=1; $i<=10; $i++)
{
    $k += $i;
    for ($j=1; $j<=$k; $j++)
    {   
       echo "*";
    }
    ...
}

This is also a good case where your loops should be initialized with 1 rather than 0, because it is more intuitive. 0-based loops work best when you are working with arrays.