- substr_replace: documentation ( source)
- implode: documentation ( source)
- strlen: documentation ( source)
- range: documentation ( source)
<?php
namespace WebSharks\Challenge;
$a = ['patdumona', 'kristinedp', 'raamdes', 'renzmp', 'reedysete'];
$r = range('D','Z',3);
foreach ($a[strlen($a[])-1] as $r){
echo implode(substr_replace($a,$r,-1));
}