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@ 2020-10-11T19:34:22Z

<?php
$orders = [
    ['order_id' => 44925, 'carrier_tracking_code' => 'LB399189926US'],
    ['order_id' => 44923, 'carrier_tracking_code' => '9205590221582717353066'],
    ['order_id' => 44490, 'carrier_tracking_code' => '9205590221582717353080'],
];

$customers = [
    79 => ['order_id' => 44490, 'customers_email_address' => 'test@test.com', 'customers_name' => 'JTest name'],
    80 => ['order_id' => 44923, 'customers_email_address' => ' test@test.com', 'customers_name' => 'Test name'],
    81 => ['order_id' => 44925, 'customers_email_address' => ' test@test.com', 'customers_name' => 'Test name']
];

$customer_index = array_combine(array_keys($customers), array_column($customers, 'order_id'));

$result = [];

foreach ($orders as $key => $order) {
    $result[$key] = $order;
    
    $customer = array_search($order['order_id'], $customer_index);
    $result[$key]['customer'] = $customer ? $customers[$customer] : [];
}

print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [order_id] => 44925 [carrier_tracking_code] => LB399189926US [customer] => Array ( [order_id] => 44925 [customers_email_address] => test@test.com [customers_name] => Test name ) ) [1] => Array ( [order_id] => 44923 [carrier_tracking_code] => 9205590221582717353066 [customer] => Array ( [order_id] => 44923 [customers_email_address] => test@test.com [customers_name] => Test name ) ) [2] => Array ( [order_id] => 44490 [carrier_tracking_code] => 9205590221582717353080 [customer] => Array ( [order_id] => 44490 [customers_email_address] => test@test.com [customers_name] => JTest name ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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