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<?php class Foo { protected function fooFunc() { return 'hello'; } } $callable = array(new Foo, 'fooFunc'); var_dump(is_callable($callable)); var_dump(call_user_func($callable));
Output for 8.0.10 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(false) Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, cannot access protected method Foo::fooFunc() in /in/tecQa:13 Stack trace: #0 {main} thrown in /in/tecQa on line 13
Process exited with code 255.
Output for 8.0.0 - 8.0.9
bool(false) Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($function) must be a valid callback, cannot access protected method Foo::fooFunc() in /in/tecQa:13 Stack trace: #0 {main} thrown in /in/tecQa on line 13
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(false) Warning: call_user_func() expects parameter 1 to be a valid callback, cannot access protected method Foo::fooFunc() in /in/tecQa on line 13 NULL
Output for 5.1.2 - 5.1.6, 5.2.0 - 5.2.17
bool(false) Warning: call_user_func(Foo::fooFunc): First argument is expected to be a valid callback in /in/tecQa on line 13 NULL
Output for 5.0.5, 5.1.0 - 5.1.1
bool(false) Fatal error: Call to protected method Foo::fooFunc() from context '' in /in/tecQa on line 13
Process exited with code 255.
Output for 5.0.0 - 5.0.4
bool(true) Fatal error: Call to protected method Foo::fooFunc() from context '' in /in/tecQa on line 13
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/tecQa on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/tecQa on line 4
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/tecQa on line 4
Process exited with code 255.

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