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@ 2022-10-01T23:08:23Z

<?php

$array = [
    [
        'User' => [
            'id' => 57341,
            'updated' => null,
            'userId' => 57341,
            'value' => null,
            'lat' => 53.4537812,
            'lon' => -2.1792437,
        ],
        [
            'feed_likes' => 'NA',
            'category_idx' => -1,
            'type' => 'User'
        ]
    ],
    [
        'User' => [
            'id' => 57336,
            'updated' => null,
            'userId' => 57336,
            'value' => null,
            'lat' => 53.473684,
            'lon' => -2.2399827,
        ],
        [
            'feed_likes' => 'NA',
            'category_idx' => -1,
            'type' => 'User'
        ]
    ],
];

var_export(
    array_map(
        fn($rows) => array_merge(...array_values($rows)),
        $array
    )
);

Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.14: array ( 0 => array ( 'id' => 57341, 'updated' => NULL, 'userId' => 57341, 'value' => NULL, 'lat' => 53.4537812, 'lon' => -2.1792437, 'feed_likes' => 'NA', 'category_idx' => -1, 'type' => 'User', ), 1 => array ( 'id' => 57336, 'updated' => NULL, 'userId' => 57336, 'value' => NULL, 'lat' => 53.473684, 'lon' => -2.2399827, 'feed_likes' => 'NA', 'category_idx' => -1, 'type' => 'User', ), )

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