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<?php trait OuterIteratorTrait { private $inner; /** * @return bool */ function isEmpty() { $iterator = clone $this->inner; $iterator->rewind(); return !$iterator->valid(); } function rewind() { $this->inner->rewind(); } function valid() { return $this->inner->valid(); } function next() { $this->inner->next(); } function current() { return $this->inner->current(); } function key() { return $this->inner->key(); } } class MappingIterator implements Iterator { use OuterIteratorTrait; private $mapper; function __construct(\Iterator $i, callable $f) { $this->inner = $i; $this->mapper = $f; } function current() { return call_user_func($this->mapper, $this->inner->current(), $this->key()); } } $i = new ArrayIterator(array(0, 2, 4)); $mapper = new MappingIterator($i, function($val){ return 2 * $val;}); var_dump(iterator_to_array($mapper));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of MappingIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/F29gc on line 58 Deprecated: Return type of MappingIterator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/F29gc on line 28 Deprecated: Return type of MappingIterator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/F29gc on line 38 Deprecated: Return type of MappingIterator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/F29gc on line 23 Deprecated: Return type of MappingIterator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/F29gc on line 18 array(3) { [0]=> int(0) [1]=> int(4) [2]=> int(8) }

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