Keep the text in the script (or paste kiosk.txt). Prefer an in-script string so the chapter runs without an attachment.

Goal

Split kiosk lines and echo city + units.

<?php
$text = "Nairobi,12\nMombasa,8\nKisumu,5";
foreach (explode("\n", $text) as $line) {
  [$city, $units] = explode(",", $line);
  echo $city, " ", $units, PHP_EOL;
}

<?php
$text = "Nairobi kiosk\nMombasa kiosk";
echo substr_count($text, "\n") + 1, PHP_EOL;

<?php
$line = "Nakuru,4";
[$city, $units] = explode(",", $line);
echo $city, PHP_EOL;
echo (int)$units, PHP_EOL;

<?php
echo "kiosk.txt is a banner download — or paste the string as above", PHP_EOL;