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<?php class MapIterator implements Iterator { private $f; private $inner; public function __construct($f, $inner) { $this->f = $f; $this->inner = $inner; } function rewind() { return $this->inner->rewind(); } function current() { return call_user_func($this->f, $this->inner->current()); } function key() { return $this->inner->key(); } function next() { return $this->inner->next(); } function valid() { return $this->inner->valid(); } } function iter_map($f, $iter) { return new MapIterator($f, $iter); } // example: function times_two($x) { return $x * 2; } $source = new ArrayIterator([0, 1, 2, 3, 4, 5, 6]); print_r(iterator_to_array(iter_map('times_two', $source))); //print_r(iterator_to_array(gen_map('times_two', $source)));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of MapIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/g3Znq on line 16 Deprecated: Return type of MapIterator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/g3Znq on line 24 Deprecated: Return type of MapIterator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/g3Znq on line 20 Deprecated: Return type of MapIterator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/g3Znq on line 28 Deprecated: Return type of MapIterator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/g3Znq on line 12 Array ( [0] => 0 [1] => 2 [2] => 4 [3] => 6 [4] => 8 [5] => 10 [6] => 12 )

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