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@ 2019-01-31T02:28:55Z

<?php

$rows = [
    [
        'SessionID'      => 1,
        'DayofWeek'      => 'Sunday',
        'SessionDetails' => '1:00 PM',
        'Description'    => 'Foo',
    ],
    [
        'SessionID'      => 1,
        'DayofWeek'      => 'Sunday',
        'SessionDetails' => '1:00 PM',
        'Description'    => 'Foo',
    ],
    [
        'SessionID'      => 2,
        'DayofWeek'      => 'Monday',
        'SessionDetails' => '10:00 AM',
        'Description'    => 'Foo',
    ],
    [
        'SessionID'      => 2,
        'DayofWeek'      => 'Monday',
        'SessionDetails' => '10:00 AM',
        'Description'    => 'Foo',
    ],
    [
        'SessionID'      => 3,
        'DayofWeek'      => 'Monday',
        'SessionDetails' => '7:00 PM',
        'Description'    => 'Barr',
    ],
    [
        'SessionID'      => 3,
        'DayofWeek'      => 'Monday',
        'SessionDetails' => '7:00 PM',
        'Description'    => 'Barr',
    ],
];

$result = [];

foreach (array_unique($rows, SORT_REGULAR) as $row) {
    $result[$row['DayofWeek']][] = $row;
}

print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [Sunday] => Array ( [0] => Array ( [SessionID] => 1 [DayofWeek] => Sunday [SessionDetails] => 1:00 PM [Description] => Foo ) ) [Monday] => Array ( [0] => Array ( [SessionID] => 2 [DayofWeek] => Monday [SessionDetails] => 10:00 AM [Description] => Foo ) [1] => Array ( [SessionID] => 3 [DayofWeek] => Monday [SessionDetails] => 7:00 PM [Description] => Barr ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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