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run code in 200+ php & hhvm versions
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<?php $myarr = ['lol' => 'abc', 'beproud' => true, 'notproud' => NULL]; $c = end((array_keys($myarr))); var_dump($c); ?>
based on kuLmD
Output for 7.0.0 - 7.2.0
Notice: Only variables should be passed by reference in /in/Sjqer on line 4 string(8) "notproud"
Output for 5.4.11 - 5.6.28
string(8) "notproud"
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/Sjqer on line 3
Process exited with code 255.