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run code in 150+ php & hhvm versions
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<?php class Foo { /** * @param callable $callback * @return Rocket_Auth_Adapter_Interface */ public function registerAuthCallback($callback) { $this->authCallback = $callback; } /** * @param Zend_Auth_Result $result * @return Zend_Auth_Result */ public function authCallback(Zend_Auth_Result $result) { $successCallback = $this->authCallback; if (is_callable($successCallback, false, $callablename)) { var_dump($callablename); $callablename($result); //$result = call_user_func_array($successCallback, array($result)); } return $result; } } class Bar { public static function callback(Zend_Auth_Result $result) { echo 'herewego '; } } class Zend_Auth_Result { } function my_callback(Zend_Auth_Result $result) { echo ' here we go (plain function)'; } $foo = new Foo(); $bar = new Bar(); $foo->registerAuthCallback(array($bar, 'callback')); $result = new Zend_Auth_Result(); $foo->authCallback($result);
Output for hhvm-3.12.0, 7.0.0 - 7.1.0
string(13) "Bar::callback" herewego
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.6.21
string(13) "Bar::callback" Fatal error: Call to undefined function Bar::callback() in /in/Rtvr4 on line 22
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/Rtvr4 on line 8
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/Rtvr4 on line 8
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/Rtvr4 on line 8
Process exited with code 255.