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<?php $set_var = 'i_am_set'; var_dump( isset($set_var) <> '' ); // Outputs bool(true) var_dump( isset($unset_var) <> '' ); // Outputs bool(false)
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
bool(true) bool(false)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/Ujtg1 on line 5
Process exited with code 255.