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@ 2021-07-04T09:14:29Z

<?php

$json = '{
    "channel": {
        "id": "xxxxxxx",
        "field1": "A",
        "created_at": "2021-06-16T19:06:15+07:00",
        "updated_at": "2021-06-16T19:09:58+07:00",
        "last_entry_id": 459
    },
    "feeds": [
        {
            "created_at": "2021-06-19T07:00:11+07:00",
            "entry_id": 1,
            "field1": "26.51"
        },
        {
            "created_at": "2021-06-19T07:00:26+07:00",
            "entry_id": 2,
            "field1": "26.78"
        },
        {
            "created_at": "2021-06-19T07:00:56+07:00",
            "entry_id": 3,
            "field1": "26.81"
        }
    ]
}';

$feeds = json_decode($json, true)['feeds'];

usort($feeds, function($a, $b) {
    return $b['field1'] <=> $a['field1'];
});

$last = array_slice($feeds, -1)[0];

printf(
    'max : %.2f %s - min: %.2f %s',
    round($feeds[0]['field1'], 2),
    $feeds[0]['created_at'],
    round($last['field1'], 2),
    $last['created_at']
);

Output for git.master, git.master_jit, rfc.property-hooks: max : 26.81 2021-06-19T07:00:56+07:00 - min: 26.51 2021-06-19T07:00:11+07:00

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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