3v4l.org

run code in 150+ php & hhvm versions
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<?php $str = ',,'; var_dump(preg_split("/\s*,\s*/", trim($str), -1, 0));
based on 3mcSf
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" }