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<?php function get_previous_letter($string){ $last = substr($string, -1); $part=substr($string, 0, -1); if(strtoupper($last)=='A'){ $l = substr($part, -1); if($l=='A'){ return substr($part, 0, -1)."Z"; } return $part.chr(ord($l)-1); }else{ return $part.chr(ord($last)-1); } } echo get_previous_letter("AAAAAA"); ?>
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