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run code in 200+ php & hhvm versions
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<?php $x = array('9876' => 54321); var_dump($x); var_dump(gettype(key($x)));
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2, 7.0.0 - 7.2.0
array(1) { [9876]=> int(54321) } string(7) "integer"
Output for hhvm-3.12.14, hhvm-3.15.4 - 3.17.3

Process exited with code 137.