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<?php $a = 'Hello world!'; var_dump((array)$a);//echo implode('', array_reverse((array)$a));
based on XssGB
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(12) "Hello world!" }
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/lTMch on line 3
Process exited with code 255.