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@ 2017-07-11T14:19:17Z

<?php

$a = [1, 2, 3];
$b = new ArrayObject($a);

function test($c)
{
    $c->append(4);
}

test($b);

var_dump($b);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

45 ms | 402 KiB | 5 Q