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@ 2019-01-11T07:58:39Z

<?php
$array1 = array (
    0 => 
    array (
        'id' => 4,
        'day_of_week' => 'sun',
        'description' => 'suntestdescription',
        'status' => 0,
        'date' => '2019-01-11'
    ),
    1 => 
    array (
        'id' => 5,
        'day_of_week' => 'mon',
        'description' => 'montestdescription',
        'status' => 0,
        'date' => '2019-01-11'
    )
);

$array2 = array (
    0 => 
    array (
        'id' => 1,
        'day_of_week' => 'mon',
        'description' => 'monupdatedtestdescription',
        'status' => 1,
        'date' => '2019-01-11'
    )
);
$array1 = array_map(function ($v) use ($array2) {
    if (($k = array_search($v['day_of_week'], array_column($array2, 'day_of_week'))) !== false && $array2[$k]['status'] == 1)
        return $array2[$k];
    else
        return $v;
}, $array1);
print_r($array1);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 4 [day_of_week] => sun [description] => suntestdescription [status] => 0 [date] => 2019-01-11 ) [1] => Array ( [id] => 1 [day_of_week] => mon [description] => monupdatedtestdescription [status] => 1 [date] => 2019-01-11 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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