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<?php class test { public function __construct() { echo 'Hello from ctor', PHP_EOL; } public function test() {} public function delta() {} } var_dump(is_callable(['test', 'delta'])); var_dump(is_callable(['test', 'test'])); var_dump(is_callable(['test', '__construct'])); call_user_func(['test', '__construct']);
Output for 8.0.10 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false) bool(false) bool(false) Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, non-static method test::__construct() cannot be called statically in /in/YH7T5:15 Stack trace: #0 {main} thrown in /in/YH7T5 on line 15
Process exited with code 255.
Output for 8.0.0 - 8.0.9
bool(false) bool(false) bool(false) Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($function) must be a valid callback, non-static method test::__construct() cannot be called statically in /in/YH7T5:15 Stack trace: #0 {main} thrown in /in/YH7T5 on line 15
Process exited with code 255.
Output for 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(true) bool(false) bool(false) Warning: call_user_func() expects parameter 1 to be a valid callback, non-static method test::__construct() cannot be called statically in /in/YH7T5 on line 15
Output for 5.2.14 - 5.2.17, 5.3.3 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/YH7T5 on line 11
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.13, 5.3.0 - 5.3.2
Strict Standards: Redefining already defined constructor for class test in /in/YH7T5 on line 7 Parse error: syntax error, unexpected '[', expecting ')' in /in/YH7T5 on line 11
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Strict Standards: Redefining already defined constructor for class test in /in/YH7T5 on line 7 Parse error: parse error, unexpected '[', expecting ')' in /in/YH7T5 on line 11
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/YH7T5 on line 6
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/YH7T5 on line 6
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/YH7T5 on line 6
Process exited with code 255.

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