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<?php $x = $y = 1; var_dump( (!$x === $y) === (!($x === $y)) ); $x = false; $y = true; var_dump(!$x === $y); var_dump(!($x === $y);
based on gJjdW
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.4.34
Parse error: syntax error, unexpected ';' in /in/36KXt on line 13
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected ';' in /in/36KXt on line 13
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/36KXt on line 13
Process exited with code 255.