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run code in 150+ php & hhvm versions
Bugs & Features
<?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(callable $fn, array $arguments) { return decorate( ['decorator'], function($fn, $arguments) { printf("Calling %s with arguments %s\n", print_r($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 7.1.0
Fatal error: Uncaught ArgumentCountError: Too few arguments to function trace(), 1 passed in /in/jASTJ on line 7 and exactly 2 expected in /in/jASTJ:67 Stack trace: #0 /in/jASTJ(7): trace(Object(Closure)) #1 /in/jASTJ(82): decorate(Array, Object(Closure), Array) #2 /in/jASTJ(96): foo() #3 {main} thrown in /in/jASTJ on line 67
Process exited with code 255.
Output for 7.0.0 - 7.0.14
Fatal error: Uncaught TypeError: Argument 2 passed to trace() must be of the type array, none given, called in /in/jASTJ on line 7 and defined in /in/jASTJ:67 Stack trace: #0 /in/jASTJ(7): trace(Object(Closure)) #1 /in/jASTJ(82): decorate(Array, Object(Closure), Array) #2 /in/jASTJ(96): foo() #3 {main} thrown in /in/jASTJ on line 67
Process exited with code 255.
Output for hhvm-3.10.0 - 3.12.0
Warning: trace() expects exactly 2 parameters, 1 given in /in/jASTJ on line 76 Catchable fatal error: Argument 2 passed to trace() must be an instance of array, undefined variable given in /in/jASTJ on line 76
Process exited with code 255.
Output for 5.4.0 - 5.6.28
Catchable fatal error: Argument 2 passed to trace() must be of the type array, none given, called in /in/jASTJ on line 7 and defined in /in/jASTJ on line 67
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/jASTJ on line 69
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/jASTJ 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/jASTJ 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/jASTJ on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/jASTJ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/jASTJ on line 3
Process exited with code 255.