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run code in 150+ php & hhvm versions
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<?php var_dump(array_count_values(array( 'ZERO' => 0, 'ZERO_STR' => '0', )));
Output for 4.3.0 - 4.4.9, 5.0.2 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> int(2) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.1
array(2) { [0]=> int(1) ["0"]=> int(1) }