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run code in 200+ php & hhvm versions
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<?php $array = array('foo' => array('bar')); var_dump(current(current($array)));
based on tDqYZ
Output for 4.3.0 - 5.0.4, 5.1.0 - 7.2.0
string(3) "bar"
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/fekbu on line 3
Process exited with code 255.