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run code in 150+ php & hhvm versions
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<?php class Base { public static function hi() { $cl = function(){ echo Left::$prot; }; $cl(); } } class Left extends Base { protected static $prot = "Hello, world!\n"; } class Right extends Base { } Base::hi(); Right::hi();
based on MWXtb
Output for 5.4.0 - 5.4.29, hhvm-3.12.0, 7.0.0 - 7.1.0
Hello, world! Hello, world!
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.30 - 5.6.28
Hello, world! Fatal error: Cannot access protected property Left::$prot in /in/4qFmp on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Fatal error: Cannot access protected property Left::$prot in /in/4qFmp on line 5
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/4qFmp on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/4qFmp on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/4qFmp on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/4qFmp on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/4qFmp on line 3
Process exited with code 255.