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@ 2023-06-09T11:05:54Z

<?php

$attendances = json_decode('[
            {
                "id": 4,
                "student_id": "18",
                "admission_no": "S18/2023",
                "class_id": "1",
                "session": "2022/2023",
                "marked": "present",
                "marked_date": "2023-05-15",
                "created_at": "2023-05-15 09:22:28"
            },
            {
                "id": 2,
                "student_id": "18",
                "admission_no": "S18/2023",
                "class_id": "1",
                "session": "2022/2023",
                "marked": "absent",
                "marked_date": "2023-05-12",
                "created_at": "2023-05-12 14:06:55"
            }
        ]', true);
        
foreach($attendances as $attendance) {
    $result[(int)explode('-', $attendance['marked_date'])[2]] = $attendance;
}
print_r($result);

Output for git.master_jit, git.master, rfc.property-hooks: Array ( [15] => Array ( [id] => 4 [student_id] => 18 [admission_no] => S18/2023 [class_id] => 1 [session] => 2022/2023 [marked] => present [marked_date] => 2023-05-15 [created_at] => 2023-05-15 09:22:28 ) [12] => Array ( [id] => 2 [student_id] => 18 [admission_no] => S18/2023 [class_id] => 1 [session] => 2022/2023 [marked] => absent [marked_date] => 2023-05-12 [created_at] => 2023-05-12 14:06:55 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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