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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(`while true ; do echo 'loop' ; done`);
Output for 5.3.0 - 5.6.30, 7.0.0 - 7.2.8
NULL
Output for hhvm-3.10.1 - 3.17.3
string(53) "Failed to exec: `while true ; do echo 'loop' ; done' "