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@ 2020-12-07T08:55:48Z

<?php

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

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

14.65 ms | 404 KiB | 5 Q