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run code in 150+ php & hhvm versions
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<?php $test = array( 'asd' => array(), 'adsasd' => array(), 'asdasdasd' => array() ); var_dump(array_sum($test));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0)