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<?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 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
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.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
array(2) { ["B"]=> array(1) { ["D"]=> array(1) { ["E"]=> array(0) { } } } ["C"]=> array(1) { ["D"]=> array(1) { ["E"]=> array(0) { } } } } Fatal error: Uncaught exception 'Exception' with message '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.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/tGMQQ on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/tGMQQ on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/tGMQQ on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/tGMQQ on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/tGMQQ on line 6
Process exited with code 255.
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