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@ 2019-04-16T23:15:21Z

<?php
$newArr = array (
    100 => 
    array (
        1 => 
        array (
            'AVA_Date' => '2019-04-18',
            'ROO_Id' => 100,
            'RAT_Id' => 9
        ),
        2 => 
        array (
            'AVA_Date' => '2019-04-20',
            'ROO_Id' => 100,
            'RAT_Id' => 10
        ),
        4 => 
        array (
            'AVA_Date' => '2019-04-21',
            'ROO_Id' => 100,
            'RAT_Id' => 10
        ),
        7 => 
        array (
            'AVA_Date' => '2019-04-22',
            'ROO_Id' => 100,
            'RAT_Id' => 9
        )
    )
);

foreach ($newArr as $key => $array) {
    $newArrOtherRooms[$key]  = array_reduce($array, function($acc, $val) {
        $room = array_keys(array_column($acc, 'ROO_Id'), $val['ROO_Id']);
        $rate = array_keys(array_column($acc, 'RAT_Id'), $val['RAT_Id']);
        $common = array_intersect($room, $rate);
        if(!empty($common)) {
            array_push($acc[current($common)]['AVA_Date'], $val['AVA_Date']);
        }
        else {
            $new_arr = $val;
            $new_arr['AVA_Date'] = [$val['AVA_Date']];
            array_push($acc, $new_arr);
        }
        return $acc;
    },[]);
}
print_r($newArrOtherRooms);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [100] => Array ( [0] => Array ( [AVA_Date] => Array ( [0] => 2019-04-18 [1] => 2019-04-22 ) [ROO_Id] => 100 [RAT_Id] => 9 ) [1] => Array ( [AVA_Date] => Array ( [0] => 2019-04-20 [1] => 2019-04-21 ) [ROO_Id] => 100 [RAT_Id] => 10 ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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