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run code in 150+ php & hhvm versions
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<?php class c { public static $f; public function __construct() { var_dump(get_class(self::$f)); } } c:$f = function() { return 'ok'; }; new c();
Output for 5.3.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(1) "c"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0
Warning: get_class() expects parameter 1 to be object, null given in /in/44DMd on line 5 bool(false)
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected ':' in /in/44DMd on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':' in /in/44DMd on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/44DMd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/44DMd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/44DMd on line 3
Process exited with code 255.