3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class Controller { public function __construct(B $b) { $this->b = $b; } } class B { public function __construct(C $c) { $this->c = $c; } } class C { public function __construct(Guzzle $guzzle) { $this->guzzle = $guzzle; } } class Guzzle { public function __construct() { } } $getReflectedConstructorParams = function($className) { return (new ReflectionClass($className))->getConstructor()->getParameters(); }; $className = 'Controller'; $graph = []; // I hate recursion, there's much better ways while (true) { $params = $getReflectedConstructorParams($className); // Guard clause if (!isset($params[0])) { // We'll have reached the Guzzle object here, the last one in the chain $prevObj = null; foreach ($graph as $obj) { // This will only happen once if ($prevObj === null) { $prevObj = new $obj; continue; } $prevObj = new $obj($prevObj); var_dump($prevObj); die; } var_dump($prevObj); break; } $className = $params[0]->getClass()->getName(); $graph[] = $className; } var_dump($graph);
based on 2kWFU
Output for 7.1.0 - 7.2.0
Fatal error: Uncaught ArgumentCountError: Too few arguments to function B::__construct(), 0 passed in /in/UJktq on line 30 and exactly 1 expected in /in/UJktq:4 Stack trace: #0 /in/UJktq(30): B->__construct() #1 {main} thrown in /in/UJktq on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Fatal error: Uncaught TypeError: Argument 1 passed to B::__construct() must be an instance of C, none given, called in /in/UJktq on line 30 and defined in /in/UJktq:4 Stack trace: #0 /in/UJktq(30): B->__construct() #1 {main} thrown in /in/UJktq on line 4
Process exited with code 255.
Output for 5.4.0 - 5.6.21
Catchable fatal error: Argument 1 passed to B::__construct() must be an instance of C, none given, called in /in/UJktq on line 30 and defined in /in/UJktq on line 4
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/UJktq on line 9
Process exited with code 255.