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run code in 150+ php & hhvm versions
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<?php echo false,"[nothing]\n"; echo true,"\n"; var_dump( false, true ); var_dump( (string) false ); var_dump( (string) true );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
[nothing] 1 bool(false) bool(true) string(0) "" string(1) "1"
Output for hhvm-3.10.0

Process exited with code 153.