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@ 2019-04-29T06:45:51Z

<?php

$source_json = <<<JSON
{
    "success": true,
    "test2": [
        [
            [
                {
                    "nama": "Henru Kay",
                    "date": "29 Apr 2019"
                },
                {
                    "nama": "B",
                    "date": "28 Apr 2019"
                }
            ]
        ],
        [
            [
                {
                    "nama": "C",
                    "date": "25 Apr 2019"
                }
            ]
        ]
    ]
}
JSON;

$source_array = json_decode($source_json, true);

array_walk($source_array['test2'], function(&$value) {
  $value = iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($value)));
});

echo json_encode($source_array, JSON_PRETTY_PRINT);

Output for 7.1.25 - 7.1.28, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: { "success": true, "test2": [ { "nama": "B", "date": "28 Apr 2019" }, { "nama": "C", "date": "25 Apr 2019" } ] }

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136.29 ms | 403 KiB | 164 Q