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@ 2015-12-01T13:03:38Z

<?php

class A {
    public $z = 10;
}

$a1 = new A();

$z = &$a1->z;
var_dump($z);

$a2 = clone $a1;

$a1 = 11;

var_dump($z);

$a2 = 12;

var_dump($z);

Output
Performance
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References
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var_dump: documentation ( source)

preferences:dark modelive preview

66.63 ms | 402 KiB | 5 Q