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run code in 150+ php & hhvm versions
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<?php var_dump(`while true ; do echo 'loop' ; done`);
Output for 5.2.12 - 5.6.28, 7.0.0 - 7.1.0
NULL
Output for hhvm-3.10.0 - 3.12.0
string(53) "Failed to exec: `while true ; do echo 'loop' ; done' "