Online PHP editor | rfc for 0S31d

@ 2023-03-22T03:58:21Z

<?php

 $array = [
        [
            'name' => 'Event A',
            'date' => '2023-02-31'
        ],
        [
            'name' => 'Event A',
            'date' => '2023-03-01'
        ],
        [
            'name' => 'Event B',
            'date' => '2023-03-02'
        ],
        [
            'name' => 'Event C',
            'date' => '2023-03-03'
        ],
        [
            'name' => 'Event D',
            'date' => '2023-04-07'
        ],
        [
            'name' => 'Event E',
            'date' => '2023-04-08'
        ],
        [
            'name' => 'Event E',
            'date' => '2023-04-09'
        ],
        [
            'name' => 'Event E',
            'date' => '2023-04-19'
        ],
        [
            'name' => 'Event E',
            'date' => '2023-04-20'
        ],
        [
            'name' => 'Event E',
            'date' => '2023-04-24'
        ],
    ];

  
$result = [];
$last = [];
foreach ($array as ['date' => $date]) {
    sscanf($date, '%d-%d-%d', $y, $m, $d);
    $key = $y . $m; // group by year-month
    if (isset($last[$key])) {
        $lastPadded = sprintf('%02s', $last[$key]);
        $thisPadded = sprintf('%02s', $d);
        if (($d - 1) === $last[$key]) {
            $result[$key] = preg_replace("~-$lastPadded\b|\b$lastPadded\b\K~", "-$thisPadded", $result[$key]); // hyphenate
        } else {
            $result[$key] = preg_replace("~\b$lastPadded\b\K~", ", $thisPadded", $result[$key], 1); // comma-separate
        }
    } else {
        $result[$key] = sprintf('%02s / %02s / %d', $d, $m, $y); // push initial string for year-month
    }
    $last[$key] = $d;
}
echo implode(", ", $result);

Output for git.master, git.master_jit, rfc.property-hooks: 31 / 02 / 2023, 01-03 / 03 / 2023, 07-09, 19-20, 24 / 04 / 2023

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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
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