Online PHP editor | output for foKL7

@ 2018-11-28T16:37:00Z

<?php

$a = array("category" => "Music", 
        "items" => array(
            array("ID" => "1", "start_date" => "2018-11-20", "end_date" => "2018-11-28"),
            array("ID" => "2", "start_date" => "2018-11-22", "end_date" => "2018-11-28"),
            array("ID" => "3", "start_date" => "2018-11-26", "end_date" => "2018-11-30"),
            array("ID" => "4", "start_date" => "2018-11-27", "end_date" => "2018-11-31"),
            array("ID" => "4", "start_date" => "2018-11-29", "end_date" => "2018-11-31")
        )
);

foreach($a['items'] as $item){
    $new[$item['end_date']]['date'] = $item['end_date'];
    $new[$item['end_date']][] = $item;
}
$res = $a;
unset($res['items']);
$res['items'] = array_values($new);


var_dump($res);

Output for 5.6.38, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: array(2) { ["category"]=> string(5) "Music" ["items"]=> array(3) { [0]=> array(3) { ["date"]=> string(10) "2018-11-28" [0]=> array(3) { ["ID"]=> string(1) "1" ["start_date"]=> string(10) "2018-11-20" ["end_date"]=> string(10) "2018-11-28" } [1]=> array(3) { ["ID"]=> string(1) "2" ["start_date"]=> string(10) "2018-11-22" ["end_date"]=> string(10) "2018-11-28" } } [1]=> array(2) { ["date"]=> string(10) "2018-11-30" [0]=> array(3) { ["ID"]=> string(1) "3" ["start_date"]=> string(10) "2018-11-26" ["end_date"]=> string(10) "2018-11-30" } } [2]=> array(3) { ["date"]=> string(10) "2018-11-31" [0]=> array(3) { ["ID"]=> string(1) "4" ["start_date"]=> string(10) "2018-11-27" ["end_date"]=> string(10) "2018-11-31" } [1]=> array(3) { ["ID"]=> string(1) "4" ["start_date"]=> string(10) "2018-11-29" ["end_date"]=> string(10) "2018-11-31" } } } }

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