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@ 2015-08-11T05:06:29Z

<?php

$_SERVER = array('HTTP_HOST' => 'nakka.me');

$a = '_SERVER';
$b = 'HTTP_HOST';

$c = $$a;

var_export($c[$b]);

Output
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var_export: documentation ( source)

preferences:dark modelive preview

55.5 ms | 402 KiB | 5 Q