- array_slice: documentation ( source)
- var_export: documentation ( source)
- min: documentation ( source)
- range: documentation ( source)
<?php
$padding = 6;
$letters = range('A', 'Z');
$i = 25;
var_export(array_slice(
$letters,
$i - min($i, $padding),
$padding + 1 + min($i, $padding)
));