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run code in 200+ php & hhvm versions
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<?php var_dump( filter_var('true', FILTER_VALIDATE_BOOLEAN), filter_var('false', FILTER_VALIDATE_BOOLEAN) );
Output for 5.6.0 - 5.6.30, hhvm-3.15.4 - 3.17.3, 7.0.0 - 7.1.7
bool(true) bool(false)
Output for hhvm-3.12.14

Process exited with code 137.