Using php to increment letters while cycling through capitilisations

Question

I am working on a project where I need to cycle through letters something like this: a,A,b,B...z,Z,aa,Aa,aA,AA,bb...zz,ZZ... in PHP.

Is it possible to do this in a scalable way?

Answer 1

Not sure it this what you looking for ?

$low = $low2 = range('a', 'z');
$upp = $upp2 = range('A', 'Z');

$arr = array();
foreach ($low as $val)
{
  $arr[] = $val;
  foreach ($low2 as $lval)
  {
    $arr[] = $val.$lval;
  }
}

foreach ($upp as $val)
{
  $arr[] = $val;
  foreach ($upp2 as $uval)
  {
    $arr[] = $val.$uval;
  }
}

foreach ($low as $val)
{
  foreach ($upp as $uval)
  {
    $arr[] = $val.$uval;
  }
}

foreach ($upp as $val)
{
  foreach ($low as $lval)
  {
    $arr[] = $val.$lval;
  }
}