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<?php function f() {} class C { function f() {} static function s() {} function __invoke() { echo "In __invoke()\n"; var_dump(func_get_args()); } } $obj = new C; $anon = function() {}; function check_callable(callable $f) {} echo "f()\n"; check_callable('f'); var_dump(is_callable('f')); echo "C::s()\n"; check_callable(['C', 's']); var_dump(is_callable(['C', 's'])); check_callable('C::s'); var_dump(is_callable('C::s')); echo "Closure\n"; check_callable($anon); var_dump(is_callable($anon)); echo "C::__invoke()\n"; check_callable($obj); var_dump(is_callable($obj)); echo "C::f()\n"; check_callable([$obj, 'f']); var_dump(is_callable([$obj, 'f']));
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
f() bool(true) C::s() bool(true) bool(true) Closure bool(true) C::__invoke() bool(true) C::f() bool(true)
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/deMSc on line 15
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/deMSc on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/deMSc on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/deMSc 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_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/deMSc 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/deMSc on line 4
Process exited with code 255.
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255.18 ms | 401 KiB | 327 Q