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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 decorator(callable $decorator) { // This function replaces 'trace' return function($wrapped) use ($decorator) { // This function replaces the function which 'trace' is used on. return function() use ($wrapped, $decorator) { var_dump($wrapped); $arguments = func_get_args(); return call_user_func($decorator, $wrapped, $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 $decorator; } function trace() { return decorate(['decorator'], function() { printf("Calling %s with arguments %s\n", print_r($fn, true), print_r($arguments, true)); return call_user_func_array($fn, $arguments); }, func_get_args()); } function foo() { return decorate(['trace'], function() { echo "Hello World\n"; }, func_get_args()); } function bar() { return decorate( [returns('string')], function() { return "foo"; }, func_get_args() ); } foo(); bar();
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Closure)#1 (0) { } Warning: Undefined variable $fn in /in/fhm9H on line 69 Warning: Undefined variable $arguments in /in/fhm9H on line 69 Calling with arguments Warning: Undefined variable $fn in /in/fhm9H on line 70 Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, no array or string given in /in/fhm9H:70 Stack trace: #0 /in/fhm9H(22): {closure}(Object(Closure), Array) #1 /in/fhm9H(11): {closure}() #2 /in/fhm9H(76): decorate(Array, Object(Closure), Array) #3 /in/fhm9H(92): foo() #4 {main} thrown in /in/fhm9H on line 70
Process exited with code 255.
Output for 8.0.10 - 8.0.30, 8.1.0 - 8.1.28
object(Closure)#1 (0) { } Warning: Undefined variable $fn in /in/fhm9H on line 69 Warning: Undefined variable $arguments in /in/fhm9H on line 69 Calling with arguments Warning: Undefined variable $fn in /in/fhm9H on line 70 Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, no array or string given in /in/fhm9H:70 Stack trace: #0 /in/fhm9H(22): {closure}(Object(Closure), Array) #1 /in/fhm9H(11): {closure}() #2 /in/fhm9H(78): decorate(Array, Object(Closure), Array) #3 /in/fhm9H(92): foo() #4 {main} thrown in /in/fhm9H on line 70
Process exited with code 255.
Output for 8.0.0 - 8.0.9
object(Closure)#1 (0) { } Warning: Undefined variable $fn in /in/fhm9H on line 69 Warning: Undefined variable $arguments in /in/fhm9H on line 69 Calling with arguments Warning: Undefined variable $fn in /in/fhm9H on line 70 Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($function) must be a valid callback, no array or string given in /in/fhm9H:70 Stack trace: #0 /in/fhm9H(22): {closure}(Object(Closure), Array) #1 /in/fhm9H(11): {closure}() #2 /in/fhm9H(78): decorate(Array, Object(Closure), Array) #3 /in/fhm9H(92): foo() #4 {main} thrown in /in/fhm9H on line 70
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
object(Closure)#1 (0) { } Notice: Undefined variable: fn in /in/fhm9H on line 69 Notice: Undefined variable: arguments in /in/fhm9H on line 69 Calling with arguments Notice: Undefined variable: fn in /in/fhm9H on line 70 Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /in/fhm9H on line 70 Notice: Undefined variable: arguments in /in/fhm9H on line 70 Warning: call_user_func_array() expects parameter 2 to be array, null given in /in/fhm9H on line 70
Output for 7.3.32 - 7.3.33, 7.4.26
object(Closure)#1 (0) { } Calling with arguments Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /in/fhm9H on line 70 Warning: call_user_func_array() expects parameter 2 to be array, null given in /in/fhm9H on line 70
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
object(Closure)#1 (0) { } Notice: Undefined variable: fn in /in/fhm9H on line 69 Notice: Undefined variable: arguments in /in/fhm9H on line 69 Calling with arguments Notice: Undefined variable: fn in /in/fhm9H on line 70 Notice: Undefined variable: arguments in /in/fhm9H on line 70 Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /in/fhm9H on line 70
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/fhm9H on line 68
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/fhm9H on line 17
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/fhm9H 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/fhm9H 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/fhm9H on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/fhm9H on line 3
Process exited with code 255.
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