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@ 2020-10-05T04:26:49Z

<?php

/**
 * @throws JsonException
 */
function alterJson(string $json): string
{
    $data = json_decode($json, false, 512, JSON_THROW_ON_ERROR);

    if (empty($data->expire_user_id)) {
        return '{}';
    }

    $data->expire_user_id = explode(',', $data->expire_user_id);
    $data->user_id = array_shift($data->expire_user_id);
    
    if ($data->expire_user_id) {
        $data->expire_user_id = implode(',', $data->expire_user_id);
    } else {
        unset($data->expire_user_id);
    }

    return json_encode($data, JSON_THROW_ON_ERROR);
}

echo alterJson(<<<JSON
    {"user_id":3,"created_at":"2020-10-05 04:59:05","expire_user_id":"2,1"}
JSON), PHP_EOL;

echo alterJson(<<<JSON
    {"user_id":3,"created_at":"2020-10-05 04:59:05","expire_user_id":"1"}
JSON), PHP_EOL;

echo alterJson(<<<JSON
    {"user_id":3,"created_at":"2020-10-05 04:59:05"}
JSON), PHP_EOL;

Output for git.master, git.master_jit, rfc.property-hooks: {"user_id":"2","created_at":"2020-10-05 04:59:05","expire_user_id":"1"} {"user_id":"1","created_at":"2020-10-05 04:59:05"} {}

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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