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@ 2017-11-16T06:40:40Z

<?php

/**
 * Increments letter
 * @param int   $number
 * @param array &$arr
 */
function increment($number, &$arr) {
    $char = end($arr);
    $char++;
    for ($i = 0; $i < $number; $i++, $char++) {
        $arr[] = $char;
    }
}

$arr = range('A', 'D');
$number = 30;

increment($number, $arr);
var_dump($arr);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
end: documentation ( source)
range: documentation ( source)

preferences:dark modelive previewkey bindings

171.71 ms | 406 KiB | 5 Q