Function 1
<?php
function cryptone($str){
for($i=0;$i<strlen($str);$i++){
$rotfirst[] = ord(substr($str,$i,1));
}
$keys = str_split(array_sum($rotfirst),2);
// clue : The second function key located on the output index to-2
}
$str = "Dear Selingkuhanku,
Maaf ya kalo pesan ini aku kirim pake...