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@ 2014-03-27T18:05:55Z

<?php

class Instantiator
{

    public $dependencies = [];

    public function instantiate($type)
    {
        return $this->instantiateInternal($type, []);
    }

    private function instantiateInternal($type, array $stack)
    {
        if (in_array($type, $stack))
        {
            throw new Exception(vsprintf('Cycle detected for `%s` as %s', [
                $type,
                print_r($stack, true),
            ]));
        }
        $stack[] = $type;
        $graph   = [];
        if (isset($this->dependencies[$type]))
        {
            foreach ($this->dependencies[$type] as $dependentType)
            {
                $graph[$dependentType] = $this->instantiateInternal($dependentType, $stack);
            }
        }
        return $graph;
    }

}

$i1 = new Instantiator();

$i1->dependencies = [
    'A' => ['B', 'C'],
    'B' => ['D'],
    'C' => ['D'],
    'D' => ['E'],
];
var_dump($i1->instantiate('A'));


$i2 = new Instantiator();

$i2->dependencies = [
    'A' => ['B', 'C'],
    'B' => ['D'],
    'C' => ['D'],
    'D' => ['A'],
];
var_dump($i2->instantiate('A'));

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["B"]=> array(1) { ["D"]=> array(1) { ["E"]=> array(0) { } } } ["C"]=> array(1) { ["D"]=> array(1) { ["E"]=> array(0) { } } } } Fatal error: Uncaught Exception: Cycle detected for `A` as Array ( [0] => A [1] => B [2] => D ) in /in/tGMQQ:17 Stack trace: #0 /in/tGMQQ(28): Instantiator->instantiateInternal('A', Array) #1 /in/tGMQQ(28): Instantiator->instantiateInternal('D', Array) #2 /in/tGMQQ(28): Instantiator->instantiateInternal('B', Array) #3 /in/tGMQQ(10): Instantiator->instantiateInternal('A', Array) #4 /in/tGMQQ(55): Instantiator->instantiate('A') #5 {main} thrown in /in/tGMQQ on line 17
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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