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run code in 200+ php & hhvm versions
Bugs & Features
<?php $test = array( 2 => 1, '_multiwidget' => 1 ); $keys = array_keys($test); unset($keys['_multiwidget']); print_r($keys);
based on M1hug
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Array ( [0] => 2 [1] => _multiwidget )