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run code in 150+ php & hhvm versions
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<?php // investigating closures in closures $f = function() { $p = 'p'; return static function() { return $p; }; }; $g = static function() { static $p = 'p'; return static function() { return $p; }; }; $n = $f(); $m = $g(); var_dump( $n());
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: p in /in/aFg8e on line 6 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_FUNCTION, expecting T_PAAMAYIM_NEKUDOTAYIM in /in/aFg8e on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/aFg8e on line 3
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 in /in/aFg8e on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/aFg8e on line 3
Process exited with code 255.