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@ 2022-11-24T21:43:07Z

<?php

$counts = [ 
     "900,google.com",
     "60,mail.yahoo.com",
     "10,mobile.sports.yahoo.com",
     "40,sports.yahoo.com",
     "300,yahoo.com",
     "10,stackoverflow.com",
     "20,overflow.com",
     "5,com.com",
     "2,en.wikipedia.org",
     "1,m.wikipedia.org",
     "1,mobile.sports",
     "1,google.co.uk"
];

function calculateClicksByDomain($dataLines)
{
    $output = [];
    foreach ($dataLines as $dataLine) {
        [$count, $domain] = explode(',', $dataLine);
        $nameParts = [];
        foreach (array_reverse(explode('.', $domain)) as $namePart) {
            array_unshift($nameParts, $namePart);
            $domain = implode('.', $nameParts);
            $output[$domain] = ($output[$domain] ?? 0) + $count;
        }
    }   
    return $output;
}

print_r(calculateClicksByDomain($counts));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [com] => 1345 [google.com] => 900 [yahoo.com] => 410 [mail.yahoo.com] => 60 [sports.yahoo.com] => 50 [mobile.sports.yahoo.com] => 10 [stackoverflow.com] => 10 [overflow.com] => 20 [com.com] => 5 [org] => 3 [wikipedia.org] => 3 [en.wikipedia.org] => 2 [m.wikipedia.org] => 1 [sports] => 1 [mobile.sports] => 1 [uk] => 1 [co.uk] => 1 [google.co.uk] => 1 )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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