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<?php // Everything you enter here will be executed by our servers. Try it! $factorial = call_user_func( function ($le) { return call_user_func( function ($f) { return $f($f); }, function ($f) use ($le) { return $le(function ($x) use ($f) { return call_user_func($f($f), $x); }); } ); }, function ($factorial) { return function ($x) use ($factorial) { if ($x > 0) { return $x * $factorial($x - 1); } return 1; }; } ); var_dump($factorial(1)); var_dump($factorial(2)); var_dump($factorial(3)); var_dump($factorial(4));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(2) int(6) int(24)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/h0q4u on line 5
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 T_FUNCTION, expecting ')' in /in/h0q4u on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/h0q4u on line 5
Process exited with code 255.