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@ 2020-08-27T08:00:20Z

<?php

    $array1 = array(
        array('id' => 1, 'name' => 'John Doe', 'age' => 20),
        array('id' => 2, 'name' => 'Mae Doe', 'age' => 17),
        array('id' => 3, 'name' => 'Mark Smith', 'age' => 35),
        array('id' => 4, 'name' => 'Selena Smith', 'age' => 15),
        array('id' => 5, 'name' => 'Shane Doe', 'age' => 26),
        array('id' => 6, 'name' => 'Will Smith', 'age' => 45)
    );
    
$array2 = array(
    array('id' => 1, 'address' => 'Singapore', 'phone_number' => '123', 'store_name' => 'ABC'),
    array('id' => 4, 'address' => 'Japan', 'phone_number' => '456', 'store_name' => 'DEF'),
    array('id' => 5, 'address' => 'Korea', 'phone_number' => '789', 'store_name' => 'GHI')
);

$addresses = array_column($array2, null, 'id');
foreach ($array1 as &$arr) {
    if (isset($addresses[$arr['id']])) $arr = array_merge($arr, $addresses[$arr['id']]);
}
print_r($array1);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 1 [name] => John Doe [age] => 20 [address] => Singapore [phone_number] => 123 [store_name] => ABC ) [1] => Array ( [id] => 2 [name] => Mae Doe [age] => 17 ) [2] => Array ( [id] => 3 [name] => Mark Smith [age] => 35 ) [3] => Array ( [id] => 4 [name] => Selena Smith [age] => 15 [address] => Japan [phone_number] => 456 [store_name] => DEF ) [4] => Array ( [id] => 5 [name] => Shane Doe [age] => 26 [address] => Korea [phone_number] => 789 [store_name] => GHI ) [5] => Array ( [id] => 6 [name] => Will Smith [age] => 45 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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