- range: documentation ( source)
<?php
$letters = range('A','Z');
$cell_name = $letters[1]."1";
echo $cell_name;
$cell_name = $letters[11]."1";
echo $cell_name;
$cell_name = $letters[111]."1";
echo $cell_name;
$cell_name = $letters[1111]."1";
echo $cell_name;
$cell_name = $letters[14]."1";
echo $cell_name;
$cell_name = $letters[321]."1";
echo $cell_name;
?>