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@ 2020-10-16T20:18:15Z

<?php
$open_hours = array (
    "Sun" => "11am-12am",
    "Mon" => "11am-12am",
    "Tue" =>  "11am-12am",
    "Wed" =>  "10am-12am",
    "Thu" =>  "9am-12am",
    "Fri" =>  "11am-12am",
    "Sat" =>  "11am-12am"
);

$result = [];
$previous = false;
foreach ($open_hours as $day => $hours) {
    if (!$previous || $previous !== $hours) {
        $result[$hours][] = $day;
    } elseif ($previous === $hours) {
        $key = array_key_last($result[$hours]);
        $current = strtok($result[$hours][$key], '-');
        $result[$hours][$key] = $current.'-'.$day;
    }
    $previous = $hours;
}

// build output (joining days with ,)
$output = [];
foreach ($result as $hours => $days) {
    $output[] = implode(', ', $days).': '.$hours;
}
// join with ;'s and output
echo implode('; ', $output);

Output for git.master, git.master_jit, rfc.property-hooks: Sun-Tue, Fri-Sat: 11am-12am; Wed: 10am-12am; Thu: 9am-12am

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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