[root@nccddev130026 workspace]# cat ~/split.php 
<?php
function main(array $args) : array
{
    $payload = $args["payload"] ?? "aaaa\nbbbbb\ncccccc";
    $separator = $args["separator"] ?? "\n";
    $result = explode($separator,$payload);
    return $result;
}

[root@nccddev130026 workspace]# cat ~/sort.php 
<?php
function main(array $args) : array
{
    $result = array_reverse($args);
    return $result;
}