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@ 2020-03-19T18:40:52Z

<?php

const DB_FILE_CONTENT = <<<'JSON'
{
    "users": {
        "sirCode": {
            "pass": "examplePass",
            "role": "admin",
            "name": "Sir Code",
            "uuid": "cwsUser-admin-5e73b921b7d2b"
        },
        "dave": {
            "pass": "supersecretlol",
            "role": "god",
            "name": "David X. Random",
            "uuid": "cwsUser-admin-5e73b921b7d2c"
        }
    }
}
JSON;

$db = json_decode(DB_FILE_CONTENT, true);

$new = '{"sirCode":{"pass":"examplePass","role":"admin","name":"Sir Code","uuid":"cwsUser-admin-5e73b921b7d2b"},"sirCode2":{"pass":"examplePass","role":"admin","name":"Sir Code","uuid":"cwsUser-admin-5e73b921b7d2b"}}';

foreach (json_decode($new, true) as $name => $user) {
    if (!isset($db['users'][$name])) {
        $db['users'][$name] = $user;
    }
}

var_dump($db);

Output for 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(1) { ["users"]=> array(3) { ["sirCode"]=> array(4) { ["pass"]=> string(11) "examplePass" ["role"]=> string(5) "admin" ["name"]=> string(8) "Sir Code" ["uuid"]=> string(27) "cwsUser-admin-5e73b921b7d2b" } ["dave"]=> array(4) { ["pass"]=> string(14) "supersecretlol" ["role"]=> string(3) "god" ["name"]=> string(15) "David X. Random" ["uuid"]=> string(27) "cwsUser-admin-5e73b921b7d2c" } ["sirCode2"]=> array(4) { ["pass"]=> string(11) "examplePass" ["role"]=> string(5) "admin" ["name"]=> string(8) "Sir Code" ["uuid"]=> string(27) "cwsUser-admin-5e73b921b7d2b" } } }

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