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run code in 150+ php & hhvm versions
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<?php $var = '0'; if(empty($var)) { echo "leeg"; } else { echo "Waarde!"; } if(trim($var)=='') { echo "leeg"; } else { echo "waarde"; } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
leegwaarde
Output for hhvm-3.10.0

Process exited with code 153.