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<?php class GenericCollection extends \SplDoublyLinkedList { private $className; public function __construct($className, $data = []) { if (!class_exists($className)) { throw new \LogicException('Invalid class name: ' . $className); } $this->className = $className; $this->items = new \SplDoublyLinkedList; foreach ($data as $item) { $this->push($item); } } private function checkItemIsInstanceOfCorrectClass($item) { if (!$item instanceof $this->className) { throw new \LogicException('Items in this collection must be instances of ' . $this->className); } } public function getClassName() { return $this->className; } public function add($item) { $this->checkItemIsInstanceOfCorrectClass($item); parent::add($item); } public function push($item) { $this->checkItemIsInstanceOfCorrectClass($item); parent::push($item); } public function unshift($item) { $this->checkItemIsInstanceOfCorrectClass($item); parent::unshift($item); } public function offsetSet($offset, $item) { $this->checkItemIsInstanceOfCorrectClass($item); parent::offsetSet($offset, $item); } } class Foo {} class Bar {} $col = new GenericCollection(Foo::class, [new Foo, new Foo]); $col->push(new Foo); $col[] = new Foo; foreach ($col as $foo) { var_dump($foo); } $col->push(new Bar);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Declaration of GenericCollection::add($item) must be compatible with SplDoublyLinkedList::add(int $index, mixed $value): void in /in/9kY9Y on line 33
Process exited with code 255.
Output for 8.0.0 - 8.0.30
Fatal error: Declaration of GenericCollection::add($item) must be compatible with SplDoublyLinkedList::add(int $index, mixed $value) in /in/9kY9Y on line 33
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of GenericCollection::add($item) should be compatible with SplDoublyLinkedList::add($index, $newval) in /in/9kY9Y on line 33 object(Foo)#2 (0) { } object(Foo)#3 (0) { } object(Foo)#5 (0) { } object(Foo)#6 (0) { } Fatal error: Uncaught LogicException: Items in this collection must be instances of Foo in /in/9kY9Y:24 Stack trace: #0 /in/9kY9Y(41): GenericCollection->checkItemIsInstanceOfCorrectClass(Object(Bar)) #1 /in/9kY9Y(69): GenericCollection->push(Object(Bar)) #2 {main} thrown in /in/9kY9Y on line 24
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Warning: Declaration of GenericCollection::add($item) should be compatible with SplDoublyLinkedList::add($index, $newval) in /in/9kY9Y on line 56 object(Foo)#2 (0) { } object(Foo)#3 (0) { } object(Foo)#5 (0) { } object(Foo)#6 (0) { } Fatal error: Uncaught LogicException: Items in this collection must be instances of Foo in /in/9kY9Y:24 Stack trace: #0 /in/9kY9Y(41): GenericCollection->checkItemIsInstanceOfCorrectClass(Object(Bar)) #1 /in/9kY9Y(69): GenericCollection->push(Object(Bar)) #2 {main} thrown in /in/9kY9Y on line 24
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Strict Standards: Declaration of GenericCollection::add() should be compatible with SplDoublyLinkedList::add($index, $newval) in /in/9kY9Y on line 56 object(Foo)#2 (0) { } object(Foo)#3 (0) { } object(Foo)#5 (0) { } object(Foo)#6 (0) { } Fatal error: Uncaught exception 'LogicException' with message 'Items in this collection must be instances of Foo' in /in/9kY9Y:24 Stack trace: #0 /in/9kY9Y(41): GenericCollection->checkItemIsInstanceOfCorrectClass(Object(Bar)) #1 /in/9kY9Y(69): GenericCollection->push(Object(Bar)) #2 {main} thrown in /in/9kY9Y on line 24
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/9kY9Y on line 61
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/9kY9Y on line 7
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/9kY9Y on line 3 Parse error: syntax error, unexpected '[' in /in/9kY9Y on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/9kY9Y on line 3 Parse error: parse error, unexpected '[' in /in/9kY9Y on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/9kY9Y on line 3 Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/9kY9Y on line 5
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
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/9kY9Y on line 3 Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/9kY9Y on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/9kY9Y on line 3 Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/9kY9Y on line 5
Process exited with code 255.
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