Here is a way to output from A to ZZZ in PHP. There are probably better ways to do this but it works. I wasn’t able to find an example written in PHP that would do this so I wrote my own. I’m not sure if there is any use that this code will provide as it is mainly just a proof of concept.

<?php
$letters = range('a', 'z');

for ($a = 0; $a < 78; $a++)
{
	if ($a >= 26)
	{
		if ($a >= 52)
		{
			// AAA to ZZZ
			$orig_letter = $letters[$a - 52];
			for ($b = 0; $b < 26; $b++)
			{
				$orig_letter2 = $orig_letter . $letters[$b];

				for ($c = 0; $c < 26; $c++)
				{
					$letter = $orig_letter2 . $letters[$c];
					echo "$letter\n";
				}
			}
		}
		else
		{
			// AA to ZZ
			$orig_letter = $letters[$a - 26];
			for ($b = 0; $b < 26; $b++)
			{
				$letter = $orig_letter . $letters[$b];
				echo "$letter\n";
			}
		}
	}
	else
	{
		// A to Z
		$letter = $letters[$a];
		echo "$letter\n";
	}
}