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@ 2020-12-07T08:38:50Z

<?php

$arr=[
    'a' => [
        'b' => 3,
    ]
];
$arrCopy = $arr;
$arrCopy['a']['b'] = 12;
var_dump($arr);
var_dump($arrCopy);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive preview

36.73 ms | 404 KiB | 5 Q