Double quotes interpolate $city. . concatenates. implode joins.

Goal

Build a kiosk line.

<?php
$city = "Nairobi";
echo "Kiosk in $city", PHP_EOL;

<?php
$s = "Mombasa";
echo strlen($s), PHP_EOL;
echo substr($s, 0, 3), PHP_EOL;

<?php
echo strtoupper("Nakuru"), PHP_EOL;
echo trim("  Eldoret  "), PHP_EOL;

<?php
echo "Nairobi" . " / " . "Kisumu", PHP_EOL;