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run code in 150+ php & hhvm versions
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<?php $x = array( 1, 2, true, null, '', false, 0, array(), 'finish' ); var_dump(array_filter($x)); var_dump(count(array_filter($x)));
based on BmdM7
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> int(1) [1]=> int(2) [2]=> bool(true) [8]=> string(6) "finish" } int(4)