PHP implements Floyd's triangle

This article introduces how to use PHP to generate and display the first n rows of Floyd's triangle. (Use lines n=5 and n=11)

Freud's triangle is a set of right-angled triangular natural numbers used in computer science education. It is named after Robert Floyd. It is defined as filling the rows of a triangle with consecutive numbers, starting with 1 in the upper left corner:

PHP code example is as follows:

<?php
$n = 5; 
echo "n = " . $n . "\n";
$count = 1;
for ($i = $n; $i > 0; $i--) 
{
  for ($j = $i; $j < $n + 1; $j++) 
   {
     printf("%4s", $count);
     $count++;
   } 
	echo "\n";
   }

Output:

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