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@ 2016-01-03T04:20:55Z

<?php

$a = new GMP(1);
$b = $a;
var_dump($a, $b);
$a += 1;
var_dump($a, $b);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

42.13 ms | 402 KiB | 5 Q