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run code in 200+ php & hhvm versions
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<?php $test = array( 0 => 2, '_multiwidget' => 1 ); print_r($test);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Array ( [0] => 2 [_multiwidget] => 1 )