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run code in 150+ php & hhvm versions
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<?php $row=array('amount' =>20,'lastname'=>'Smith'); $row['formatted_date']=date('M d,Y'); print_r($row);
based on rbDMB
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [amount] => 20 [lastname] => Smith [formatted_date] => Oct 16,2014 )