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@ 2021-01-19T12:40:42Z

<?php

class TestClass
{
    public int $a; 
}

$test = new TestClass();
$string = 'foo';
$test->int = &$string;
var_dump($test->int);
$test->int = [];
var_dump($test->int);

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

59.6 ms | 402 KiB | 5 Q