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<?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 $obj) { if ($prevObj === null) { $prevObj = new $obj; continue; } $prevObj = new $obj($prevObj); } var_dump($prevObj); break; } $className = $params[0]->getClass()->getName(); $graph[] = $className; } var_dump($graph);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Method ReflectionParameter::getClass() is deprecated in /in/2kWFU on line 42 Deprecated: Method ReflectionParameter::getClass() is deprecated in /in/2kWFU on line 42 Deprecated: Method ReflectionParameter::getClass() is deprecated in /in/2kWFU on line 42 Fatal error: Uncaught ArgumentCountError: Too few arguments to function B::__construct(), 0 passed in /in/2kWFU on line 29 and exactly 1 expected in /in/2kWFU:4 Stack trace: #0 /in/2kWFU(29): B->__construct() #1 {main} thrown in /in/2kWFU on line 4
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught ArgumentCountError: Too few arguments to function B::__construct(), 0 passed in /in/2kWFU on line 29 and exactly 1 expected in /in/2kWFU:4 Stack trace: #0 /in/2kWFU(29): B->__construct() #1 {main} thrown in /in/2kWFU on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33
Fatal error: Uncaught TypeError: Argument 1 passed to B::__construct() must be an instance of C, none given, called in /in/2kWFU on line 29 and defined in /in/2kWFU:4 Stack trace: #0 /in/2kWFU(29): B->__construct() #1 {main} thrown in /in/2kWFU on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Catchable fatal error: Argument 1 passed to B::__construct() must be an instance of C, none given, called in /in/2kWFU on line 29 and defined in /in/2kWFU on line 4
Process exited with code 255.
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