<?php final class TypedArray extends ArrayIterator { private $class; public function __construct($class) { $this->class = $class; parent::__construct(array()); } public function offsetSet($index, $newValue) { if (!$newValue instanceof $this->class) { throw new \InvalidArgumentException('Expected instance of ' . $this->class . ' got ' . get_class($newValue)); } } } class A {} $array = new TypedArray(A::class); $array[] = new A; $array['boo'] = new A; foreach ($array as $key => $value) { echo $key . ' -> '; var_dump($value); echo PHP_EOL; } $array[] = 'blah'; /* implements Iterator, ArrayAccess { private $class; private $array; public function __construct($class) { $this->class = $class; $this->array = array(); } public function current() { return current($this->array); } public function key() { return key($this->array); } public function next() { return next($this->array); } public function rewind() { return rewind($this->array); } } */
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