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@ 2019-12-30T11:22:34Z

<?php
        //Enter your code here, enjoy!
$a = [
   "test1" => [
        'value' => 1, 
        "date"=> '2019-01-01'
    ], 
    "test2" => [
        'value' => 2, 
        "date"=> '2019-01-01'
    ]
];
$b = [
    "test1" => [
        'value' => 3, 
        "date"=> '2018-01-01'
    ], 
    "test2" => [
        'value' => 4, 
        "date"=> '2018-01-01'
    ]
];

$res = array_map(null, $a, $b);
print_r($res);

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

57.18 ms | 402 KiB | 5 Q