index.php

<?php

    function calculateSum(int $min, int $max) {
        $tally = 0;
        
        for ($i = $min; $i < $max; $i++) {
            $tally += $i;
        }
        
        return $tally;
    }

    // Problem 1:
    function getSumsFor(array $upTos) {
        // for loop? How many items are in the array?

        // foreach?

        // Handle as a queue
        // Pop the item off the end - and handle it
        // stop when the queue is empty
    }

    // Assume range is 0, up to the value
    $upTos1 = [2, 10, 20];

    $results = getSumsFor($upTos1);

    // Extension - allow the variable to specify a min and a max for each (rather than assume 0 up to ...)
    $upTos2 = [
        // ??
    ];

    print_r($results);


    // Problem 2:
    // Represent the new cohort as an array of objects - see: https://www.php.net/manual/en/language.oop5.basic.php
    $cohort = [
        $person1,   // instance of a 'User' class that holds the data for a single user
        $person2,
        ...
    ];

    // All done? Continue to work through the Web Essentials online material
?>