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run code in 200+ php & hhvm versions
Bugs & Features
<?php $myArray = array( 0, NULL, '', 'true', 'false', true, '0', -1 ); print_r( array_filter($myArray) );
Output for 4.3.0 - 7.2.0
Array ( [3] => true [4] => false [5] => 1 [7] => -1 )