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run code in 150+ php & hhvm versions
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<?hh echo "HELL YEAH";
based on oXDYW
Output for hhvm-3.12.0
HELL YEAH
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /in/sjTZ7 on line 2
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh echo "HELL YEAH";