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run code in 200+ php & hhvm versions
Bugs & Features
<?php $s = ''; print "isset: '" . isset($s) . "'. "; //print "!empty: '" . !empty($s) . "'"; ?>
based on J4nBb
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.22.0, 7.0.0 - 7.3.0alpha1
isset: '1'.