1 2 3 6 5 4 7 8 9 12 11 10 Pyramid Print in PhP

<?php

$row = 4;
$start = 1;
$i = 1;

for ($i; $i <= $row; $i++)
{
    if($i % 2 == 0)
    {
        $first = $start + 2;
        $sec = $start + 1;
        printf("%d %d %d <br>", $first, $sec, $start);
        $start = $start + 3;
    }else{
        printf("%d %d %d<br>", $start, $start+1, $start+2);
        $start = $start + 3;
    }
}

// Output
// 1 2 3
// 6 5 4
// 7 8 9
// 12 11 10

Alternative

$rows=4;
$cols=10; // Any Numbers Of Column
$count=1;

for($i=1; $i<=$rows; $i++)
{
    if($i%2==0){
        $count=$count+$cols-1;
    }
    for($j=$cols; $j>=1; $j--)
    {
        echo $count." ";
        if($i%2==0)
            $count--;
        else
            $count++;
    }
    if($i%2==0){
        $count=$count+$cols+1;
    }
    echo "<br>";
}
?>