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run code in 150+ php & hhvm versions
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<?php class Foo { private static $bar = 'bar'; function getBar() { return static::$bar; } } class FooProxy extends Foo { } var_dump((new FooProxy())->getBar());
based on OQkrh
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Cannot access property FooProxy::$bar in /in/SQ74P:6 Stack trace: #0 /in/SQ74P(13): Foo->getBar() #1 {main} thrown in /in/SQ74P on line 6
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Invalid static property access: FooProxy::bar in /in/SQ74P on line 6
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.6.28
Fatal error: Cannot access property FooProxy::$bar in /in/SQ74P on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/SQ74P on line 13
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC in /in/SQ74P on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC in /in/SQ74P on line 6
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/SQ74P on line 4
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/SQ74P on line 4
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/SQ74P on line 4
Process exited with code 255.