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<?php $instance = new class {}; $c = get_class($instance); $buf = substr($c, -14); $class_name = "class@anonymous".chr(0).__FILE__.$buf; eval("$class_name extends stdClass {};"); var_dump(new $class_name);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Parse error: syntax error, unexpected token "@", expecting identifier in /in/FfH9b(9) : eval()'d code on line 1
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Parse error: syntax error, unexpected '@', expecting identifier (T_STRING) in /in/FfH9b(9) : eval()'d code on line 1
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/FfH9b on line 3
Process exited with code 255.

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