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@ 2021-09-18T12:46:15Z

<?php

$openTimeslots = ['02-09-2021' => [ '8:00-10:00', '16:00-19:00'],
                  '03-09-2021' => [ '7:00-10:00', '16:15-19:00', 
                                   '14:00-16:00', '13:00-14:15'],
                  '04-09-2021' => [ '7:15-10:00', '15:15-18:15']];

$common = array_map(fn($timeRange) => explode('-', $timeRange), array_shift($openTimeslots));

foreach ($openTimeslots as $slots) {
    foreach ($slots as $slot) {
        [$start, $end] = explode('-', $slot);
        foreach ($common as [&$commonStart, &$commonEnd]) {
            if ($start >= $commonStart && $start < $commonEnd) {
                $commonStart = $start;
            }
            if ($end > $commonStart && $end <= $commonEnd) {
                $commonEnd = $end;
            }
        }
    }
}
var_export(
    array_map(
        fn($subarray) => implode('-', $subarray),
        $common
    )
);

Output for git.master_jit, git.master, rfc.property-hooks: array ( 0 => '8:00-10:00', 1 => '16:15-18:15', )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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