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<?php function decorate(array $decorators, callable $fn, array $arguments = array()) { foreach (array_reverse($decorators) as $decorator) { if (is_callable($decorator)) { $fn = $decorator($fn); } } return call_user_func_array($fn, $arguments); } function expects(/* $type,... */) { $types = func_get_args(); $decorator = function(callable $fn) use ($types) { $wrapper = function() use ($fn, $types) { foreach (func_get_args() as $i => $arg) { if (($type = gettype($arg)) !== $types[$i] and isset($types[$i]) and $types[$i] !== 'mixed') { throw new \InvalidArgumentException("Expected type of argument $i to be {$types[$i]}, got $type"); } } return call_user_func_array($fn, func_get_args()); }; return $wrapper; }; return $decorator; } function returns($type) { $decorator = function($fn) use ($type) { $wrapper = function() use ($fn, $type) { $returnValue = call_user_func_array($fn, func_get_args()); if (($returnType = gettype($returnValue)) !== $type) { throw new \UnexpectedValueException("Expected return type $type, got $returnType"); } return $returnValue; }; return $wrapper; }; return $decorator; } function bar() { return decorate( [ expects('integer'), returns('string') ], function($foo) { return (array) "foo"; }, func_get_args() ); } bar(0); bar("foo");
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught UnexpectedValueException: Expected return type string, got array in /in/Q002f:42 Stack trace: #0 /in/Q002f(26): {closure}(0) #1 /in/Q002f(11): {closure}(0) #2 /in/Q002f(56): decorate(Array, Object(Closure), Array) #3 /in/Q002f(68): bar(0) #4 {main} thrown in /in/Q002f on line 42
Process exited with code 255.
Output for 7.0.20, 7.1.5 - 7.1.33, 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
Fatal error: Uncaught UnexpectedValueException: Expected return type string, got array in /in/Q002f:42 Stack trace: #0 /in/Q002f(26): {closure}(0) #1 /in/Q002f(11): {closure}(0) #2 /in/Q002f(64): decorate(Array, Object(Closure), Array) #3 /in/Q002f(68): bar(0) #4 {main} thrown in /in/Q002f on line 42
Process exited with code 255.
Output for 7.0.0 - 7.0.14, 7.1.0
Fatal error: Uncaught UnexpectedValueException: Expected return type string, got array in /in/Q002f:42 Stack trace: #0 /in/Q002f(26): {closure}(0) #1 /in/Q002f(11): {closure}(0) #2 /in/Q002f(63): decorate(Array, Object(Closure), Array) #3 /in/Q002f(68): bar(0) #4 {main} thrown in /in/Q002f on line 42
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Fatal error: Uncaught exception 'UnexpectedValueException' with message 'Expected return type string, got array' in /in/Q002f:42 Stack trace: #0 [internal function]: {closure}(0) #1 /in/Q002f(26): call_user_func_array(Object(Closure), Array) #2 [internal function]: {closure}(0) #3 /in/Q002f(11): call_user_func_array(Object(Closure), Array) #4 /in/Q002f(65): decorate(Array, Object(Closure), Array) #5 /in/Q002f(68): bar(0) #6 {main} thrown in /in/Q002f on line 42
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/Q002f on line 57
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/Q002f on line 18
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/Q002f on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/Q002f on line 3
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_ARRAY, expecting ')' in /in/Q002f on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/Q002f on line 3
Process exited with code 255.
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