希望我能把它颠倒过来：PHP编程

Question

This what I made.It become

              1
             121
            12321
           1234321

But I hope I can get

           1234321
            12321
             121
              1

I have tried so many times, but I can't make this. Anyone can help??

Do I make some mistake?

<?php
$p=4;
for($x=1;$x<=$p;$x++)
{
    for($q=$p;$q>$x;$q--)
    {
      echo "<center>";
    }
    for($k=1;$k<$x;$k++) 
    {
      echo $k;
    }
    if($x>=1) 
    {
        for($v=$x; $v>=1; $v--)
        {
           echo $v;
        }
    }      
echo "<br>";
}
?> 

I would appreciate it, if you can tell me my mistake. Thank You

Answer 1

You approach is correct, just minor update, Reverse the first for limits also, remove echo "<center>"; from inside the loop and place it outside

<?php
$p=4;
echo "<center>";
for($x=$p;$x>0;$x--)
{
    /* for($q=$p;$q>$x;$q--)
    {                                  //Not at all needed
      echo "<center>";
    } */
    for($k=1;$k<$x;$k++) 
    {
      echo $k;
    }
    if($x>=1) 
    {
        for($v=$x; $v>=1; $v--)
        {
           echo $v;
        }
    }      
echo "<br>";
}
echo "</center>";