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Informations about the package iterable
Iterable ########
Utilities for dealing with PHP's iterators and the iterable type.
Features
- converting iterable values to arrays
- caching iterator
Requirements
- PHP 7.1+
Usage
IterableHelper::toArray()
Convert an iterable value to an array.
$array = IterableHelper::toArray($iterable);
- if the value is already an array, it is returned unchanged
- if an iterator yields multiple values with the same key, only the last value will be present in the array
IterableHelper::toList()
Convert an iterable value to an array with consecutive integer indexes.
$list = IterableHelper::toList($iterable);
- if the value is already an array, only its values will be returned (keys are discarded)
- if the value is traversable, all its values will be returned
CachingIterator
CachingIterator can be used to wrap any \Traversable instance so
it can rewinded, counted and iterated multiple times.
- as the traversable is iterated, its key-value pairs are cached in memory
- the cached key-value pairs are reused for future iterations
- when the traversable is fully iterated, the internal reference to it is dropped (since it is no longer needed)
This is mostly useful with generators or other non-rewindable traversables.
function generator() { yield random_int(0, 99); yield random_int(100, 199); yield random_int(200, 299); }
$cachingIterator = new CachingIterator(generator());
print_r(iterator_to_array($cachingIterator)); print_r(iterator_to_array($cachingIterator)); var_dump(count($cachingIterator));
Output:
Array
(
[0] => 29
[1] => 107
[2] => 249
)
Array
(
[0] => 29
[1] => 107
[2] => 249
)
int(3)
