How to print Floyd’s triangle – PHP

Floyd’s triangle is a right-angled triangular array of natural numbers.
It is named after Robert Floyd. It is defined by filling the rows of the triangle with consecutive numbers, starting with a 1 in the top left corner.
Now let’s see the code example:

<?php
     $a =1;
    for($i=0;$i<=4;$i++)
    {
      for($j=1;$j<=$i;$j++)
        {
            echo $a." ";
                  $a++;
        }
        echo "<br>";
    }

Output :

1
2 3
4 5 6
7 8 9 10

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