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@ 2015-10-19T10:14:36Z

<?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 git.master, git.master_jit, rfc.property-hooks: 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.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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