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run code in 200+ php & hhvm versions
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<?php $values['test'] = "foo']) OR die('RCE');"; $myVar = 'test'; eval("\$x = (isset(\$values$myVar)) ? \$values$myVar : null;"); print_r($x);
based on aQWWc
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3