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@ 2022-08-16T08:23:53Z

<?php

$startArr = json_decode('[ { "meterid": 23484, "expired_total": 1 }, { "meterid": 23489, "expired_total": 3 } ]', true);

$expArr = json_decode('[ { "meterid": 23478, "start_total": 1 }, { "meterid": 23489, "start_total": 1 }, { "meterid": 23490, "start_total": 2 } ]', true);

// $output_result { "23478": { "meterid": 23478, "start_total": 1, "expired_total": 0 }, "23484": { "meterid": 23484, "start_total": 0, "expired_total": 1 } "23489": { "meterid": 23489, "start_total": 1, "expired_total": 3 } "23490": { "meterid": 23490, "start_total": 2, "expired_total": 0 } }

$result = [];
$default = array_fill_keys(['meterid', 'start_total', 'expired_total'], 0);
foreach (array_merge($startArr, $expArr) as $row) {
    if (!isset($result[$row['meterid']])) {
        $result[$row['meterid']] = array_replace($default, $row);
    } else {
        $result[$row['meterid']] += $row;
    }
}
var_export($result);

Output for rfc.property-hooks, git.master, git.master_jit: array ( 23484 => array ( 'meterid' => 23484, 'start_total' => 0, 'expired_total' => 1, ), 23489 => array ( 'meterid' => 23489, 'start_total' => 0, 'expired_total' => 3, ), 23478 => array ( 'meterid' => 23478, 'start_total' => 1, 'expired_total' => 0, ), 23490 => array ( 'meterid' => 23490, 'start_total' => 2, 'expired_total' => 0, ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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