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@ 2018-10-14T02:50:07Z

<?php
$array = [
    [
        "route_id" => 1539871200,
        "booking_id" => 171,
        "route" => "Boattrip Destination 2",
        "date" => "18 October 2018",
        "time" => "14:00 - 16:00"
    ],
    [
        "route_id" => 1539856800,
        "booking_id" => 170,
        "route" => "Boattrip Destination 2",
        "date" => "18 October 2018",
        "time" => "10:00 - 12:00"
    ],
    [
        "route_id" => 1539856800,
        "booking_id" => 162,
        "route" => "Boattrip Destination 2",
        "date" => "18 October 2018",
        "time" => "10:00 - 12:00"
    ]
];

foreach ($array as $set) {
    if (isset($result[$set["route_id"]])) {
        $result[$set["route_id"]]["booking_ids"][] = $set["booking_id"];
    } else {
        $result[$set["route_id"]] = [
            "route" => $set["route_id"],
            "date" => $set["date"],
            "time" => $set["time"],
            "booking_ids" => [$set["booking_id"]]
        ];
    }
}
ksort($result);  // ... you did say you wanted to sort them by route_id
var_export($result);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 1539856800 => array ( 'route' => 1539856800, 'date' => '18 October 2018', 'time' => '10:00 - 12:00', 'booking_ids' => array ( 0 => 170, 1 => 162, ), ), 1539871200 => array ( 'route' => 1539871200, 'date' => '18 October 2018', 'time' => '14:00 - 16:00', 'booking_ids' => array ( 0 => 171, ), ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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