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run code in 150+ php & hhvm versions
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<?php $arr = array('order_source' => array('google','facebook'), 'order_medium' => 'google-text'); print_r($arr);
based on 64IqT
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [order_source] => Array ( [0] => google [1] => facebook ) [order_medium] => google-text )
Output for hhvm-3.10.0

Process exited with code 153.