Incrementing alphabetic character

I know how to increment number in a php script just need a loop and one on every iteration of the loop but is there a way to increment alphabetic letter the same way starting with A and next B and C and so on?
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gamebitsAsked:
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Cornelia YoderArtistCommented:
Set up an array

$letters=array('a', 'b', 'c', 'd');  // etc

for ($i=1; $i<26; $i++)
{
  $index = $letters[$i];
  then use $index as your letter....
}
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ZylochCommented:
I think you can just use the increment operator. For instance:

$letter = 'a';
$letter++;
echo($letter);
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secondvCommented:
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